1
|
Dales R, Lukina AO, Romero-Meza R, Blanco-Vidal C, Cakmak S. Ambient air pollution exposure and COVID-19 related hospitalizations in Santiago, Chile. Sci Rep 2024; 14:14186. [PMID: 38902344 DOI: 10.1038/s41598-024-64668-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 06/11/2024] [Indexed: 06/22/2024] Open
Abstract
Morbidity and mortality from several diseases are increased on days of higher ambient air pollution. We carried out a daily time-series analysis with distributive lags to study the influence of short-term air pollution exposure on COVID-19 related hospitalization in Santiago, Chile between March 16 and August 31, 2020. Analyses were adjusted for temporal trends, ambient temperature, and relative humidity, and stratified by age and sex. 26,579 COVID-19 hospitalizations were recorded of which 24,501 were laboratory confirmed. The cumulative percent change in hospitalizations (95% confidence intervals) for an interquartile range increase in air pollutants were: 1.1 (0.2, 2.0) for carbon monoxide (CO), 0.30 (0.0, 0.50) for nitrogen dioxide (NO2), and 2.7 (1.9, 3.0) for particulate matter of diameter ≤ 2.5 microns (PM2.5). Associations with ozone (O3), particulate matter of diameter ≤ 10 microns (PM10) and sulfur dioxide (SO2) were not significant. The observed effect of PM2.5 was significantly greater for females and for those individuals ≥ 65 years old. This study provides evidence that daily increases in air pollution, especially PM2.5, result in a higher observed risk of hospitalization from COVID-19. Females and the elderly may be disproportionately affected.
Collapse
Affiliation(s)
- Robert Dales
- Environmental Health Science and Research Bureau, Health Canada, 251 Sir Frederic Banting Driveway, Ottawa, ON, K1A 0K9, Canada
- University of Ottawa and Ottawa Hospital Research Institute, Ottawa, Canada
| | - Anna O Lukina
- Environmental Health Science and Research Bureau, Health Canada, 251 Sir Frederic Banting Driveway, Ottawa, ON, K1A 0K9, Canada
| | - Rafael Romero-Meza
- School of Economics and Business, Universidad Alberto Hurtado, Santiago, Chile
| | | | - Sabit Cakmak
- Environmental Health Science and Research Bureau, Health Canada, 251 Sir Frederic Banting Driveway, Ottawa, ON, K1A 0K9, Canada.
| |
Collapse
|
2
|
Wei S, Semple S. Exposure to fine particulate matter (PM 2.5) from non-tobacco sources in homes within high-income countries: a systematic review. AIR QUALITY, ATMOSPHERE, & HEALTH 2022; 16:553-566. [PMID: 36467893 PMCID: PMC9703437 DOI: 10.1007/s11869-022-01288-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 11/19/2022] [Indexed: 06/17/2023]
Abstract
UNLABELLED The health impacts associated with exposure to elevated concentrations of fine particulate matter (PM2.5) are well recognised. There is a substantial number of studies characterising PM2.5 concentrations outdoors, as well as in homes within low- and middle-income countries. In high-income countries (HICs), there is a sizeable literature on indoor PM2.5 relating to smoking, but the evidence on exposure to PM2.5 generated from non-tobacco sources in homes is sparse. This is especially relevant as people living in HICs spend the majority of their time at home, and in the northern hemisphere households often have low air exchange rates for energy efficiency. This review identified 49 studies that described indoor PM2.5 concentrations generated from a variety of common household sources in real-life home settings in HICs. These included wood/solid fuel burning appliances, cooking, candles, incense, cleaning and humidifiers. The reported concentrations varied widely, both between sources and within groups of the same source. The burning of solid fuels was found to generate the highest indoor PM2.5 concentrations. On occasion, other sources were also reported to be responsible for high PM2.5 concentrations; however, this was only in a few select examples. This review also highlights the many inconsistencies in the ways data are collected and reported. The variable methods of measurement and reporting make comparison and interpretation of data difficult. There is a need for standardisation of methods and agreed contextual data to make household PM2.5 data more useful in epidemiological studies and aid comparison of the impact of different interventions and policies. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s11869-022-01288-8.
Collapse
Affiliation(s)
- Shuying Wei
- Faculty of Health Sciences and Sport, University of Stirling, Stirling, FK9 4LA UK
| | - Sean Semple
- Institute for Social Marketing and Health, University of Stirling, Stirling, FK9 4LA UK
| |
Collapse
|
3
|
Lim S, Bassey E, Bos B, Makacha L, Varaden D, Arku RE, Baumgartner J, Brauer M, Ezzati M, Kelly FJ, Barratt B. Comparing human exposure to fine particulate matter in low and high-income countries: A systematic review of studies measuring personal PM 2.5 exposure. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 833:155207. [PMID: 35421472 PMCID: PMC7615091 DOI: 10.1016/j.scitotenv.2022.155207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 04/02/2022] [Accepted: 04/08/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Due to the adverse health effects of air pollution, researchers have advocated for personal exposure measurements whereby individuals carry portable monitors in order to better characterise and understand the sources of people's pollution exposure. OBJECTIVES The aim of this systematic review is to assess the differences in the magnitude and sources of personal PM2.5 exposures experienced between countries at contrasting levels of income. METHODS This review summarised studies that measured participants personal exposure by carrying a PM2.5 monitor throughout their typical day. Personal PM2.5 exposures were summarised to indicate the distribution of exposures measured within each country income category (based on low (LIC), lower-middle (LMIC), upper-middle (UMIC), and high (HIC) income countries) and between different groups (i.e. gender, age, urban or rural residents). RESULTS From the 2259 search results, there were 140 studies that met our criteria. Overall, personal PM2.5 exposures in HICs were lower compared to other countries, with UMICs exposures being slightly lower than exposures measured in LMICs or LICs. 34% of measured groups in HICs reported below the ambient World Health Organisation 24-h PM2.5 guideline of 15 μg/m3, compared to only 1% of UMICs and 0% of LMICs and LICs. There was no difference between rural and urban participant exposures in HICs, but there were noticeably higher exposures recorded in rural areas compared to urban areas in non-HICs, due to significant household sources of PM2.5 in rural locations. In HICs, studies reported that secondhand smoke, ambient pollution infiltrating indoors, and traffic emissions were the dominant contributors to personal exposures. While, in non-HICs, household cooking and heating with biomass and coal were reported as the most important sources. CONCLUSION This review revealed a growing literature of personal PM2.5 exposure studies, which highlighted a large variability in exposures recorded and severe inequalities in geographical and social population subgroups.
Collapse
Affiliation(s)
- Shanon Lim
- MRC Centre for Environment and Health, Imperial College London, UK.
| | - Eridiong Bassey
- MRC Centre for Environment and Health, Imperial College London, UK
| | - Brendan Bos
- MRC Centre for Environment and Health, Imperial College London, UK
| | - Liberty Makacha
- MRC Centre for Environment and Health, Imperial College London, UK; Place Alert Labs, Department of Surveying and Geomatics, Faculty of Science and Technology, Midlands State University, Zimbabwe; Department of Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, UK
| | - Diana Varaden
- MRC Centre for Environment and Health, Imperial College London, UK; NIHR-HPRU Environmental Exposures and Health, School of Public Health, Imperial College London, UK
| | - Raphael E Arku
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, Amherst, USA
| | - Jill Baumgartner
- Institute for Health and Social Policy, and Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Canada
| | - Michael Brauer
- School of Population and Public Health, The University of British Columbia, Vancouver, Canada; Institute for Health Metrics and Evaluation, University of Washington, Seattle, USA
| | - Majid Ezzati
- MRC Centre for Environment and Health, Imperial College London, UK; Abdul Latif Jameel Institute for Disease and Emergency Analytics, Imperial College London, UK; Regional Institute for Population Studies, University of Ghana, Legon, Ghana
| | - Frank J Kelly
- MRC Centre for Environment and Health, Imperial College London, UK; NIHR-HPRU Environmental Exposures and Health, School of Public Health, Imperial College London, UK
| | - Benjamin Barratt
- MRC Centre for Environment and Health, Imperial College London, UK; NIHR-HPRU Environmental Exposures and Health, School of Public Health, Imperial College London, UK
| |
Collapse
|
4
|
Riederer AM, Krenz JE, Tchong-French MI, Torres E, Perez A, Younglove LR, Jansen KL, Hardie DC, Farquhar SA, Sampson PD, Metwali N, Thorne PS, Karr CJ. Effectiveness of portable HEPA air cleaners on reducing indoor endotoxin, PM 10, and coarse particulate matter in an agricultural cohort of children with asthma: A randomized intervention trial. INDOOR AIR 2021; 31:1926-1939. [PMID: 34288127 PMCID: PMC8577577 DOI: 10.1111/ina.12858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 04/05/2021] [Accepted: 05/02/2021] [Indexed: 06/13/2023]
Abstract
We conducted a randomized trial of portable HEPA air cleaners in the homes of children age 6-12 years with asthma in the Yakima Valley, Washington. All families received asthma education while intervention families also received two HEPA cleaners (child's bedroom, living room). We collected 14-day integrated samples of endotoxin in settled dust and PM10 and PM10-2.5 in the air of the children's bedrooms at baseline and one-year follow-up, and used linear regression to compare follow-up levels, adjusting for baseline. Seventy-one families (36 HEPA, 35 control) completed the study. Baseline geometric mean (GSD) endotoxin loadings were 1565 (6.3) EU/m2 and 2110 (4.9) EU/m2 , respectively, in HEPA vs. control homes while PM10 and PM10-2.5 were 22.5 (1.9) μg/m3 and 9.5 (2.9) μg/m3 , respectively, in HEPA homes, and 19.8 (1.8) μg/m3 and 7.7 (2.0) μg/m3 , respectively, in control homes. At follow-up, HEPA families had 46% lower (95% CI, 31%-57%) PM10 on average than control families, consistent with prior studies. In the best-fit heterogeneous slopes model, HEPA families had 49% (95% CI, 6%-110%) and 89% lower (95% CI, 28%-177%) PM10-2.5 at follow-up, respectively, at 50th and 75th percentile baseline concentrations. Endotoxin loadings did not differ significantly at follow-up (4% lower, HEPA homes; 95% CI, -87% to 50%).
Collapse
Affiliation(s)
- Anne M. Riederer
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Jennifer E. Krenz
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Maria I. Tchong-French
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Elizabeth Torres
- Northwest Communities Education Center, Radio KDNA, Granger, WA, USA
| | - Adriana Perez
- Yakima Valley Farm Workers Clinic, Toppenish, WA, USA
| | - Lisa R. Younglove
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Karen L. Jansen
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - David C. Hardie
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Stephanie A. Farquhar
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Paul D. Sampson
- Department of Biostatistics, University of Washington, Seattle, WA, USA
| | - Nervana Metwali
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Peter S. Thorne
- Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, IA, USA
| | - Catherine J. Karr
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
- Department of Pediatrics, University of Washington, Seattle, WA, USA
| |
Collapse
|
5
|
Dales R, Blanco-Vidal C, Romero-Meza R, Schoen S, Lukina A, Cakmak S. The association between air pollution and COVID-19 related mortality in Santiago, Chile: A daily time series analysis. ENVIRONMENTAL RESEARCH 2021; 198:111284. [PMID: 33971125 PMCID: PMC8547777 DOI: 10.1016/j.envres.2021.111284] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 04/13/2021] [Accepted: 05/03/2021] [Indexed: 05/20/2023]
Abstract
BACKGROUND Exposure to ambient air pollution is a risk factor for morbidity and mortality from lung and heart disease. RESEARCH QUESTION Does short term exposure to ambient air pollution influence COVID-19 related mortality? STUDY DESIGN AND METHODOLOGY Using time series analyses we tested the association between daily changes in air pollution measured by stationary monitors in and around Santiago, Chile and deaths from laboratory confirmed or suspected COVID-19 between March 16 and August 31, 2020. Results were adjusted for temporal trends, temperature and humidity, and stratified by age and sex. RESULTS There were 10,069 COVID-19 related deaths of which 7659 were laboratory confirmed. Using distributed lags, the cumulative relative risk (RR) (95% CI) of mortality for an interquartile range (IQR) increase in CO, NO2 and PM2.5 were 1.061 (1.033-1.089), 1.067 (1.023-1.103) and 1.058 (1.034-1.082), respectively There were no significant differences in RR by sex.. In those at least 85 years old, an IQR increase in NO2 was associated with a 12.7% (95% CI 4.2-22.2) increase in daily mortality. CONCLUSION This study provides evidence that daily increases in air pollution increase the risk of dying from COVID-19, especially in the elderly.
Collapse
Affiliation(s)
- Robert Dales
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada; University of Ottawa and Ottawa Hospital Research Institute, Ottawa, Canada
| | | | - Rafael Romero-Meza
- School of Economics and Business, Universidad Alberto Hurtado, Santiago, Chile
| | | | - Anna Lukina
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada
| | - Sabit Cakmak
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada.
| |
Collapse
|
6
|
Cakmak S, Blanco-Vidal C, Lukina AO, Dales R. The association between air pollution and hospitalization for patients with systemic lupus erythematosus in Chile: A daily time series analysis. ENVIRONMENTAL RESEARCH 2021; 192:110469. [PMID: 33189741 DOI: 10.1016/j.envres.2020.110469] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/30/2020] [Accepted: 11/09/2020] [Indexed: 06/11/2023]
Abstract
Genetic and environmental factors are thought to influence the activity of systemic lupus erythematosus (SLE), but relatively little is known about the effects of ambient air pollution. Using pollution data from air monitoring stations in the urban centers in Santiago Chile, along with daily patient hospitalization data from 2001 to 2012, an association between ambient air pollution and daily hospital admissions for SLE was tested using generalized linear models. Averaged over all regions pollutant mean 24 h concentrations were: 0.96 ppm carbon monoxide (CO), 64 ppb ozone (O3), 43 ppb nitrogen dioxide (NO2), 9 ppb sulphur dioxide (SO2), 29 μg/m3 particulate matter ≤ 2.5 μm in mean aerodynamic diameter (PM2.5), and 67 μg/m3 particulate matter ≤ 10 μm in diameter (PM10). The relative risk estimates in single pollutant models for an interquartile range (IQR) increase in pollutant were: RR = 1.34 (95% CI: 1.06-1.83) for SO2, RR = 1.60 (95% CI: 1.15-2.24) for CO, and RR = 1.41 (95% CI: 1.14-1.86) for PM2.5. In two-pollutant models, the significance of SO2 and PM2.5 persisted despite adjustments for each of the other measured pollutants. These findings suggest that acute increases in air pollution increase the risk of hospitalization with a primary diagnosis of SLE.
Collapse
Affiliation(s)
- Sabit Cakmak
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada
| | | | - Anna O Lukina
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada
| | - Robert Dales
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada; University of Ottawa and Ottawa Hospital Research Institute, Ottawa, Canada.
| |
Collapse
|
7
|
Evangelopoulos D, Katsouyanni K, Keogh RH, Samoli E, Schwartz J, Barratt B, Zhang H, Walton H. PM 2.5 and NO 2 exposure errors using proxy measures, including derived personal exposure from outdoor sources: A systematic review and meta-analysis. ENVIRONMENT INTERNATIONAL 2020; 137:105500. [PMID: 32018132 DOI: 10.1016/j.envint.2020.105500] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 12/30/2019] [Accepted: 01/15/2020] [Indexed: 05/27/2023]
Abstract
BACKGROUND The use of proxy exposure estimates for PM2.5 and NO2 in air pollution studies instead of personal exposures, introduces measurement error, which can produce biased epidemiological effect estimates. Most studies consider total personal exposure as the gold standard. However, when studying the effects of ambient air pollution, personal exposure from outdoor sources is the exposure of interest. OBJECTIVES We assessed the magnitude and variability of exposure measurement error by conducting a systematic review of the differences between personal exposures from outdoor sources and the corresponding measurements for ambient concentrations in order to increase understanding of the measurement error structures of the pollutants. DATA SOURCES AND ELIGIBILITY CRITERIA We reviewed the literature (ISI Web of Science, Medline, 2000-2016) for English language studies (in any age group in any location (NO2) or Europe and North America (PM2.5)) that reported repeated measurements over time both for personal and ambient PM2.5 or NO2 concentrations. Only a few studies reported personal exposure from outdoor sources. We also collected data for infiltration factors and time-activity patterns of the individuals in order to estimate personal exposures from outdoor sources in every study. STUDY APPRAISAL AND SYNTHESIS METHODS Studies using modelled rather than monitored exposures were excluded. Type of personal exposure monitor was assessed. Random effects meta-analysis was conducted to quantify exposure error as the mean difference between "true" and proxy measures. RESULTS Thirty-two papers for PM2.5 and 24 for NO2 were identified. Outdoor sources were found to contribute 44% (range: 33-55%) of total personal exposure to PM2.5 and 74% (range: 57-88%) to NO2. Overall estimates of personal exposure (24-hour averages) from outdoor sources were 9.3 μg/m3 and 12.0 ppb for PM2.5 and NO2 respectively, while the corresponding difference between these exposures and the ambient concentrations (i.e. the measurement error) was 5.72 μg/m3 and 7.17 ppb. Our findings indicated also higher error variability for NO2 than PM2.5. Large heterogeneity was observed which was not explained sufficiently by geographical location or age group of the study sample. LIMITATIONS, CONCLUSIONS AND IMPLICATIONS OF KEY FINDINGS Relying only on information available in published studies led to some limitations: the contribution of outdoor sources to total personal exposure for NO2 had to be inferred, individual variation in exposure misclassification was unavailable and instrument error could not be addressed. The larger magnitude and variability of errors for NO2 compared with PM2.5 has implications for biases in the health effect estimates of multi-pollutant epidemiological models. Results suggest that further research is needed regarding personal exposure studies and measurement error bias in epidemiological models.
Collapse
Affiliation(s)
- Dimitris Evangelopoulos
- NIHR HPRU Health Impact of Environmental Hazards, Analytical, Environmental & Forensic Sciences, King's College London, UK.
| | - Klea Katsouyanni
- NIHR HPRU Health Impact of Environmental Hazards, Analytical, Environmental & Forensic Sciences, King's College London, UK
| | - Ruth H Keogh
- Department of Medical Statistics, London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, UK
| | - Evangelia Samoli
- Department of Hygiene, Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, 75 Mikras Asias Str, 115 27 Athens, Greece
| | - Joel Schwartz
- Department of Environmental Health, T.H. Chan School of Public Health, Harvard University, Boston, MA, USA
| | - Ben Barratt
- NIHR HPRU Health Impact of Environmental Hazards, Analytical, Environmental & Forensic Sciences, King's College London, UK
| | - Hanbin Zhang
- NIHR HPRU Health Impact of Environmental Hazards, Analytical, Environmental & Forensic Sciences, King's College London, UK
| | - Heather Walton
- NIHR HPRU Health Impact of Environmental Hazards, Analytical, Environmental & Forensic Sciences, King's College London, UK
| |
Collapse
|
8
|
Dales R, Blanco-Vidal C, Cakmak S. The Association Between Air Pollution and Hospitalization of Patients With Idiopathic Pulmonary Fibrosis in Chile: A Daily Time Series Analysis. Chest 2020; 158:630-636. [PMID: 32092324 DOI: 10.1016/j.chest.2020.02.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 02/03/2020] [Accepted: 02/06/2020] [Indexed: 10/25/2022] Open
Abstract
BACKGROUND Idiopathic pulmonary fibrosis (IPF) causes progressive dyspnea, hypoxemia, and death within a few years. Little is known about the effect of air pollution on disease exacerbations. RESEARCH QUESTION Are acute increases in air pollution a risk factor for hospitalization of patients with a primary diagnosis of IPF. STUDY DESIGN AND METHODS Hospital admissions for IPF are coded J84.1 by the International Classification of Disease, 10th Revision. Using ambient air pollution and climate data from seven air monitoring stations distributed in the seven urban centers in Santiago, Chile, along with daily patient hospitalization data from 2001 to 2012, a linear association between daily ambient air pollution and daily J84.1 hospital admissions was tested using generalized linear models. RESULTS Average pollutant levels for all regions were as follows: carbon monoxide was 0.96 ppm, ozone was 64 ppb, nitrogen dioxide (NO2) was 43 ppb, sulfur dioxide was 9 ppb, particulate matter < 2.5 μm in diameter was 29 μg/m3 and particulate matter < 10 μm in diameter (PM10) was 67 μg/m3. For the combined Santiago area, relative risk estimates of J84.1 hospitalizations for all pollutants (except ozone), adjusted for age, sex, and weather were statistically significant. In the two-pollutant models, the significance of NO2 and PM10 persisted despite adjustments for each of the other measured pollutants. INTERPRETATION Our findings suggest that acute increases in air pollution are a risk factor for hospitalization of patients with a primary diagnosis of IPF.
Collapse
Affiliation(s)
- Robert Dales
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada
| | | | - Sabit Cakmak
- Population Studies Division, Environmental Health Science & Research Bureau, Health Canada, Canada.
| |
Collapse
|
9
|
Salonen H, Salthammer T, Morawska L. Human exposure to NO 2 in school and office indoor environments. ENVIRONMENT INTERNATIONAL 2019; 130:104887. [PMID: 31195224 DOI: 10.1016/j.envint.2019.05.081] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/28/2019] [Accepted: 05/31/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Although nitrogen dioxide (NO2) is one of the most common air pollutants encountered indoors, and extensive literature has examined the link between NO2 exposure and duration causing adverse respiratory effects in susceptible populations, information about global and local exposure to NO2 in different indoor environments is limited. To synthesize the existing knowledge, this review analyzes the magnitude of and the trends in global and local exposure to NO2 in schools and offices, and the factors that control exposure. METHODS For the literature review, Web of Science, SCOPUS, Google Scholar, and PubMed were searched using 42 search terms and their combinations to identify manuscripts, reports, and directives published between 1971 and 2019. The search was then extended to the reference lists of relevant articles. RESULTS The calculated median, as well as the mean, concentration of NO2 in school (median 21.1 μg/m3; mean 29.4 μg/m3) and office settings (median 22.7 μg/m3; mean 25.1 μg/m3) was well below the World Health Organization (WHO) guideline of 40 μg/m3 for the annual mean NO2 concentration. However, a large range of average concentrations of NO2 were reported, from 6.00 to 68.5 μg/m3 and from 3.40 to 56.5 μg/m3 for school and office environments, respectively, indicating situations where the WHO guidelines are exceeded. Outdoor levels of NO2 are a reliable predictor of indoor NO2 levels across seasons, with mean and median Indoor/Outdoor (I/O) ratios of 0.9 and 0.7 in school and 0.9 and 0.8 in office environments, respectively. The absence of major indoor NO2 emission sources and NO2 sinks, including chemical reactions and deposition, are the reasons for lower indoor NO2 concentrations. During the winter, outdoor NO2 concentrations are generally higher than during the summer. In addition, various building and indoor environment characteristics, such as type of ventilation, air exchange rates, airtightness of the envelope, furnishing and surface characteristics of the building, location of the building (urban versus suburban and proximity to traffic routes), as well as occupants' behavior (such as opening windows), have been statistically significantly associated with indoor NO2 levels in school and office environments. CONCLUSIONS Indoor exposure to NO2 from the infiltration of ambient air can be significant in urban areas, and in the case of high traffic volume. Although reducing transportation emissions is challenging, there are several easier means to reduce indoor NO2 concentrations, including a ventilation strategy with suitable filters; location planning of new schools, classrooms, and ventilating windows or intakes; traffic planning (location and density); and reducing the use of NO2-releasing indoor sources.
Collapse
Affiliation(s)
- Heidi Salonen
- Aalto University, Department of Civil Engineering, PO Box 12100, FI-00076 Aalto, Finland; Queensland University of Technology, International Laboratory for Air Quality and Health, 2 George Street, Brisbane Q 4001, Australia.
| | - Tunga Salthammer
- Queensland University of Technology, International Laboratory for Air Quality and Health, 2 George Street, Brisbane Q 4001, Australia; Fraunhofer WKI, Department of Material Analysis and Indoor Chemistry, 38108 Braunschweig, Germany.
| | - Lidia Morawska
- Queensland University of Technology, International Laboratory for Air Quality and Health, 2 George Street, Brisbane Q 4001, Australia
| |
Collapse
|
10
|
Rezaei M, Riksen MJPM, Sirjani E, Sameni A, Geissen V. Wind erosion as a driver for transport of light density microplastics. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 669:273-281. [PMID: 30878934 DOI: 10.1016/j.scitotenv.2019.02.382] [Citation(s) in RCA: 129] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 02/23/2019] [Accepted: 02/24/2019] [Indexed: 05/27/2023]
Abstract
Microplastic pollution in the environment is a growing concern in today's world. Wind-eroded sediment, as an environmental transport pathway of microplastics, can result in environmental and human exposure far beyond its sources. For the first time, this study investigates the presence of microplastics in wind-eroded sediments from different land uses in the Fars Province, Iran. Eleven test plots were selected based on land use and wind erosion risk. On each plot, wind erosion was simulated using a portable wind tunnel and the eroded sediment was collected for further analysis aimed at measuring light density microplastics (LDMP). The LDMPs were extracted in both soil and wind-eroded sediment using a floatation method and then further examined using microscopy. Annual LDMP transport by wind erosion was estimated using wind data from the study areas. LDMPs were detected in six study areas in the Fars Province which are highly prone to wind erosion. Although LDMPs were found mostly in agricultural land, it was also detected in the soils and sediments from two natural areas. The total concentrations of LDMPs in polluted areas were 6.91 and 20.27 mg kg-1 of microplastics in soil and wind-eroded sediments, respectively. The enrichment ratio for LDMP ranged from 2.83 to 7.63 in different areas. The erosion rate of LDMP ranged from 0.08 to 1.48 mg m-2 min-1. The results of this study confirmed the key role of wind erosion in the spread of microplastics in terrestrial environments which could form an exposure risk to humans via direct inhalation of the particles transported with the dust.
Collapse
Affiliation(s)
- Mahrooz Rezaei
- Department of Soil Science, School of Agriculture, Shiraz University, Shiraz, Iran; Soil Physics and Land Management Group, Wageningen University & Research, PO. Box 47, 6700 AA Wageningen, the Netherlands.
| | - Michel J P M Riksen
- Soil Physics and Land Management Group, Wageningen University & Research, PO. Box 47, 6700 AA Wageningen, the Netherlands
| | - Elham Sirjani
- Department of Soil Science, School of Agriculture, Shiraz University, Shiraz, Iran
| | - Abdolmajid Sameni
- Department of Soil Science, School of Agriculture, Shiraz University, Shiraz, Iran
| | - Violette Geissen
- Soil Physics and Land Management Group, Wageningen University & Research, PO. Box 47, 6700 AA Wageningen, the Netherlands
| |
Collapse
|
11
|
Dehghani S, Moore F, Vasiluk L, Hale BA. The influence of physicochemical parameters on bioaccessibility-adjusted hazard quotients for copper, lead and zinc in different grain size fractions of urban street dusts and soils. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2018; 40:1155-1174. [PMID: 28600726 DOI: 10.1007/s10653-017-9994-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 05/31/2017] [Indexed: 06/07/2023]
Abstract
When the hazard quotient for ingestion (HQI) of a trace element in soil and dust particles is adjusted for the element's bioaccessibility, the HQI is typically reduced as compared to its calculation using pseudo-total element concentration. However, those studies have mostly used bulk particles (<2 mm or <250 µm), and the reduction in HQI when expressed as bioaccessible metal may not be similar among particle size fractions, the possibility probed by the present study of street dusts and soils collected in Tehran. The highest Cu, Pb and Zn near-total concentrations occurred in the finest particles of dusts and soils. Bioaccessible concentrations of Cu, Pb and Zn in the particles (mg kg-1) were obtained using simple bioaccessibility extraction test (SBET). The bioaccessibility (%) did not vary much among near-total concentrations. In the bulk (<250 µm) sample, the bioaccessible concentration of Cu and Pb increased as the pH of sample increased, while Zn bioaccessibility (%) in the bulk particles was influenced by organic matter and cation exchange capacity. X-ray diffraction identified sulfide and sulfate minerals in all of the size-fractionated particles, which are insoluble to slightly soluble in acidic conditions and included most of the Cu and Pb in the samples. The only Zn-bearing mineral identified was hemimorphite, which would be highly soluble in the SBET conditions. The calculated HQI suggested potential non-carcinogenic health risk to children and adults from ingestions of soils and dusts regardless of particle size consideration, in the order of Zn > Pb ≥ Cu. The HQI calculated from near-total metal was not much different for particle size classes relative to bulk particles; however, the bioaccessibility percent-adjusted HQI for Pb was higher for the smaller particles than the bulk. This work is novel in its approach to compare HQI for a bulk sample of particles with its composite particle size fractions.
Collapse
Affiliation(s)
- Sharareh Dehghani
- Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, 71454, Iran.
| | - Farid Moore
- Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, 71454, Iran
| | - Luba Vasiluk
- School of Environmental Sciences, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Beverley A Hale
- School of Environmental Sciences, University of Guelph, Guelph, ON, N1G 2W1, Canada
| |
Collapse
|
12
|
Dehghani S, Moore F, Akhbarizadeh R. Microplastic pollution in deposited urban dust, Tehran metropolis, Iran. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:20360-20371. [PMID: 28707239 DOI: 10.1007/s11356-017-9674-1] [Citation(s) in RCA: 221] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/27/2017] [Indexed: 05/22/2023]
Abstract
Environmental pollutants such as microplastics have become a major concern over the last few decades. We investigated the presence, characteristics, and potential health risks of microplastic dust ingestion. The plastic load of 88 to 605 microplastics per 30 g dry dust with a dominance of black and yellow granule microplastics ranging in size from 250 to 500 μm was determined in 10 street dust samples using a binocular microscope. Fluorescence microscopy was found to be ineffective for detecting and counting plastic debris. Scanning electron microscopy, however, was useful for accurate detection of microplastic particles of different sizes, colors, and shapes (e.g., fiber, spherule, hexagonal, irregular polyhedron). Trace amounts of Al, Na, Ca, Mg, and Si, detected using energy dispersive X-ray spectroscopy, revealed additives of plastic polymers or adsorbed debris on microplastic surfaces. As a first step to estimate the adverse health effects of microplastics in street dust, the frequency of microplastic ingestion per day/year via ingestion of street dust was calculated. Considering exposure during outdoor activities and workspaces with high abundant microplastics as acute exposure, a mean of 3223 and 1063 microplastic particles per year is ingested by children and adults, respectively. Consequently, street dust is a potentially important source of microplastic contamination in the urban environment and control measures are required.
Collapse
Affiliation(s)
- Sharareh Dehghani
- Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz, 71454, Iran.
| | - Farid Moore
- Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz, 71454, Iran
| | - Razegheh Akhbarizadeh
- Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz, 71454, Iran
| |
Collapse
|
13
|
Grivas G, Dimakopoulou K, Samoli E, Papakosta D, Karakatsani A, Katsouyanni K, Chaloulakou A. Ozone exposure assessment for children in Greece - Results from the RESPOZE study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 581-582:518-529. [PMID: 28062110 DOI: 10.1016/j.scitotenv.2016.12.159] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/23/2016] [Accepted: 12/23/2016] [Indexed: 06/06/2023]
Abstract
Ozone exposure of 179 children in Athens and Thessaloniki, Greece was assessed during 2013-2014, by repeated weekly personal measurements, using passive samplers. O3 was also monitored at school locations of participants to characterize community-level ambient exposure. Average personal concentrations in the two cities (5.0 and 2.8ppb in Athens and Thessaloniki, respectively) were considerably lower than ambient concentrations (with mean personal/ambient ratios of 0.13-0.15). The temporal variation of personal concentrations followed the -typical for low-latitude areas- pattern of cold-warm seasons. However, differences were detected between temporal distributions of personal and ambient concentrations, since personal exposures were affected by additional factors which present seasonal variability, such as outdoor activity and house ventilation. Significant spatial contrasts were observed between urban and suburban areas, for personal concentrations in Athens, with higher exposure for children residing in the N-NE part of the area. In Thessaloniki, spatial variations in personal concentrations were less pronounced, echoing the spatial pattern of ambient concentrations, a result of complex local meteorology and the smaller geographical expansion of the study area. Ambient concentration was identified as the most important factor influencing personal exposures (correlation coefficients between 0.36 and 0.67). Associations appeared to be stronger with ambient concentrations measured at school locations of children, than to those reported by the nearest site of the air quality monitoring network, indicating the importance of community-representative outdoor monitoring for characterization of personal-ambient relationships. Time spent outdoors by children was limited (>90% of the time they remained indoors), but -due to the lack of indoor sources- it was found to exert significant influence on personal concentrations, affecting inter-subject and spatiotemporal variability. Additional parameters that were identified as relevant for the determination of personal concentrations were indoor ventilation conditions (specifically indoor times with windows open) and the use of wood-burning in open fireplaces for heating as an ozone sink.
Collapse
Affiliation(s)
- Georgios Grivas
- School of Chemical Engineering, National Technical University of Athens, GR 15780, Greece.
| | - Konstantina Dimakopoulou
- Department of Hygiene, Epidemiology and Medical Statistics, National and Kapodistrian University of Athens, School of Medicine, 75, Mikras Asias Street, 115 27 Athens, Greece
| | - Evangelia Samoli
- Department of Hygiene, Epidemiology and Medical Statistics, National and Kapodistrian University of Athens, School of Medicine, 75, Mikras Asias Street, 115 27 Athens, Greece
| | - Despina Papakosta
- Pulmonary Department, G. Papanikolaou Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Anna Karakatsani
- 2nd Pulmonary Department, "ATTIKON" University Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Klea Katsouyanni
- Department of Hygiene, Epidemiology and Medical Statistics, National and Kapodistrian University of Athens, School of Medicine, 75, Mikras Asias Street, 115 27 Athens, Greece; Department of Primary Care & Public Health Sciences and MRC-PHE Centre for Environment and Health, King's College London, London, UK
| | | |
Collapse
|
14
|
Lee BH, Yee SW, Kang DH, Yeo MS, Kim KW. Multi-zone simulation of outdoor particle penetration and transport in a multi-story building. BUILDING SIMULATION 2016; 10:525-534. [PMID: 32218899 PMCID: PMC7090779 DOI: 10.1007/s12273-016-0340-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 10/30/2016] [Accepted: 10/31/2016] [Indexed: 05/03/2023]
Abstract
In areas with poor ambient air quality, indoor particle concentrations can be significantly affected by particulate matter originating outdoors. The indoor environments of multi-zone and multi-story buildings are affected differently by outdoor particles compared with single-family houses, because of the buildings' more complicated airflow characteristics. The objective of this study is to analyze outdoor particle penetration and transport, and their impact on indoor air, in a multi-zone and multi-story building using a CONTAMW simulation. For the airflow and particle transport analysis, the building leakage, penetration coefficients, and deposition rates were determined by on-site experiments. The results of airflow simulations for cold winters show that outdoor air infiltrates through the lower part of building and exfiltrates from the upper part. The results of the particle simulation also indicated that the airflow characteristics, combined with deposition rates, cause the lower floors of a multi-story building to be exposed to higher fine particle concentrations compared with the upper floors of the building. The study demonstrated that the CONTAMW simulation can be useful in analyzing the impact of outdoor particles on indoor environments through the identification of key particle transport parameters and validated airflow simulations.
Collapse
Affiliation(s)
- Byung Hee Lee
- Department of Architecture and Architectural Engineering, Graduate School of Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826 Republic of Korea
| | - Su Whan Yee
- Ecoenergy Research Institute, Building of Mechanical Part & Material Testing Busan Tecno Park, 30, Gwahaksandan 1-ro 60beon-gil, Gangseo-gu, Busan, 46742 Republic of Korea
| | - Dong Hwa Kang
- Department of Architectural Engineering, College of Urban Sciences, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, 02504 Republic of Korea
| | - Myoung Souk Yeo
- Department of Architecture and Architectural Engineering, College of Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826 Republic of Korea
| | - Kwang Woo Kim
- Department of Architecture and Architectural Engineering, College of Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826 Republic of Korea
| |
Collapse
|
15
|
Barraza F, Jorquera H, Heyer J, Palma W, Edwards AM, Muñoz M, Valdivia G, Montoya LD. Short-term dynamics of indoor and outdoor endotoxin exposure: Case of Santiago, Chile, 2012. ENVIRONMENT INTERNATIONAL 2016; 92-93:97-105. [PMID: 27065310 DOI: 10.1016/j.envint.2016.03.039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 03/24/2016] [Accepted: 03/28/2016] [Indexed: 06/05/2023]
Abstract
Indoor and outdoor endotoxin in PM2.5 was measured for the very first time in Santiago, Chile, in spring 2012. Average endotoxin concentrations were 0.099 and 0.094 [EU/m(3)] for indoor (N=44) and outdoor (N=41) samples, respectively; the indoor-outdoor correlation (log-transformed concentrations) was low: R=-0.06, 95% CI: (-0.35 to 0.24), likely owing to outdoor spatial variability. A linear regression model explained 68% of variability in outdoor endotoxins, using as predictors elemental carbon (a proxy of traffic emissions), chlorine (a tracer of marine air masses reaching the city) and relative humidity (a modulator of surface emissions of dust, vegetation and garbage debris). In this study, for the first time a potential source contribution function (PSCF) was applied to outdoor endotoxin measurements. Wind trajectory analysis identified upwind agricultural sources as contributors to the short-term, outdoor endotoxin variability. Our results confirm an association between combustion particles from traffic and outdoor endotoxin concentrations. For indoor endotoxins, a predictive model was developed but it only explained 44% of endotoxin variability; the significant predictors were tracers of indoor PM2.5 dust (Si, Ca), number of external windows and number of hours with internal doors open. Results suggest that short-term indoor endotoxin variability may be driven by household dust/garbage production and handling. This would explain the modest predictive performance of published models that use answers to household surveys as predictors. One feasible alternative is to increase the sampling period so that household features would arise as significant predictors of long-term airborne endotoxin levels.
Collapse
Affiliation(s)
- Francisco Barraza
- Departmento de Ingeniería Química y Bioprocesos, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, Santiago 7820436, Chile
| | - Héctor Jorquera
- Departmento de Ingeniería Química y Bioprocesos, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, Santiago 7820436, Chile; Centro de Investigación en Nanotecnología y Materiales Avanzados, CIEN-UC, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, Santiago 7820436, Chile.
| | - Johanna Heyer
- Departmento de Ingeniería Química y Bioprocesos, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, Santiago 7820436, Chile
| | - Wilfredo Palma
- Departamento de Estadística, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago 7820436, Chile
| | - Ana María Edwards
- Facultad de Química, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, Santiago 7820436, Chile
| | - Marcelo Muñoz
- Facultad de Química, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, Santiago 7820436, Chile
| | - Gonzalo Valdivia
- Departamento de Salud Pública, Pontificia Universidad Católica de Chile, Marcoleta 340, Santiago 8330033, Chile
| | - Lupita D Montoya
- Civil, Environmental and Architectural Engineering Department, University of Colorado Boulder, UCB 428, Boulder, Colorado, United States
| |
Collapse
|
16
|
[Indoor air pollution by fine particulate matter in the homes of newborns]. ACTA ACUST UNITED AC 2016; 87:343-350. [PMID: 27242100 DOI: 10.1016/j.rchipe.2016.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 04/17/2016] [Accepted: 04/22/2016] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Air pollution by particulate matter (PM) is a major public health problem. In Chile, the study has focused on outdoor air and PM10, rather than indoor air and PM2.5. Because newborns and infants spend most of their time at home, it is necessary to evaluate the exposure to indoor air pollution in this susceptible population. OBJECTIVE To determine concentration of PM2.5 in the homes of newborns and identify the emission sources of the pollutants. PATIENTS AND METHOD The PM2.5 concentration ([PM2.5]) was collected over a 24hour period in 207 households. Baseline sociodemographic information and environmental factors (heating, ventilation, smoking and house cleaning), were collected. RESULTS The median [PM2.5] was 107.5μg/m3. Family history of asthma was associated with lower [PM2.5] (P=.0495). Homes without heating showed a lower median [PM2.5], 58.6μg/m3, while those using firewood, kerosene, and electricity ranged between 112.5 and 114.9, and coal users' homes reached 162.9μg/m3. Wood using homes had significant differences (P=.0164) in median [PM2.5] whether the stove had complete combustion (98.2μg/m3) vs. incomplete (112.6μg/m3), or a salamander stove (140.6μg/m3). Cigarette smoking was reported in 8.7% of the households, but was not associated with the [PM2.5]. Ventilation was associated with a higher median [PM2.5] (120.6 vs. 99.1μg/m3, P=.0039). CONCLUSION We found homes with high [PM2.5]. Residential wood consumption was almost universal, and it is associated with the [PM2.5]. Natural ventilation increased MP2.5, probably due to infiltration from outside.
Collapse
|
17
|
Bozkurt Z, Doğan G, Arslanbaş D, Pekey B, Pekey H, Dumanoğlu Y, Bayram A, Tuncel G. Determination of the personal, indoor and outdoor exposure levels of inorganic gaseous pollutants in different microenvironments in an industrial city. ENVIRONMENTAL MONITORING AND ASSESSMENT 2015; 187:590. [PMID: 26311267 DOI: 10.1007/s10661-015-4816-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 08/19/2015] [Indexed: 06/04/2023]
Abstract
We measured SO2, NO2 and O3 concentrations during the summer and winter in Kocaeli, Turkey. The sampling was carried out indoors and outdoors at homes, schools and offices. Personal samplers were also used to determine personal exposures to these pollutants. High NO2 and SO2 concentrations were observed in outdoor samples collected close to locations characterized by heavy urban traffic. Concentrations of O3, on the other hand, were higher in rural areas around the city due to ozone distillation. For both sampling periods, the concentrations of outdoor SO2 and O3 were higher than for indoor and personal samples; however, the NO2 concentrations were higher in indoor and personal samples, indicating that outdoor sources significantly contribute to indoor SO2 and O3 levels and that indoor NO2 concentrations are primarily modulated by sources within buildings. Seasonal variations in pollutant concentrations showed statistically significant differences. Indoor and outdoor concentrations of NO2 and SO2 measured in the winter were higher than the levels measured in the summer; O3 concentrations, on the other hand, exhibited the opposite trend. Active-to-passive concentration ratios for NO2, SO2 and O3 were 0.99, 1.08 and 1.16, respectively; the corresponding outdoor ratios were 0.95, 0.99 and 1.00.
Collapse
Affiliation(s)
- Zehra Bozkurt
- Department of Environmental Engineering, Düzce University, Düzce, 81620, Turkey,
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Branco PTBS, Alvim-Ferraz MCM, Martins FG, Sousa SIV. The microenvironmental modelling approach to assess children's exposure to air pollution - A review. ENVIRONMENTAL RESEARCH 2014; 135:317-332. [PMID: 25462682 DOI: 10.1016/j.envres.2014.10.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 09/30/2014] [Accepted: 10/02/2014] [Indexed: 06/04/2023]
Abstract
Exposures to a wide spectrum of air pollutants were associated to several effects on children's health. Exposure assessment can be used to establish where and how air pollutants' exposures occur. However, a realistic estimation of children's exposures to air pollution is usually a great ethics challenge, especially for young children, because they cannot intentionally be exposed to contaminants and according to Helsinki declaration, they are not old enough to make a decision on their participation. Additionally, using adult surrogates introduces bias, since time-space-activity patterns are different from those of children. From all the different available approaches for exposure assessment, the microenvironmental (ME) modelling (indirect approach, where personal exposures are estimated or predicted from microenvironment measurements combined with time-activity data) seemed to be the best to assess children's exposure to air pollution as it takes into account the varying levels of pollution to which an individual is exposed during the course of the day, it is faster and less expensive. Thus, this review aimed to explore the use of the ME modelling approach methodology to assess children's exposure to air pollution. To meet this goal, a total of 152 articles, published since 2002, were identified and titles and abstracts were scanned for relevance. After exclusions, 26 articles were fully reviewed and main characteristics were detailed, namely: (i) study design and outcomes, including location, study population, calendar time, pollutants analysed and purpose; and (ii) data collection, including time-activity patterns (methods of collection, record time and key elements) and pollution measurements (microenvironments, methods of collection and duration and time resolution). The reviewed studies were from different parts of the world, confirming the worldwide application, and mostly cross-sectional. Longitudinal studies were also found enhancing the applicability of this approach. The application of this methodology on children is different from that on adults because of data collection, namely the methods used for collecting time-activity patterns must be different and the time-activity patterns are itself different, which leads to select different microenvironments to the data collection of pollutants' concentrations. The most used methods to gather information on time-activity patterns were questionnaires and diaries, and the main microenvironments considered were home and school (indoors and outdoors). Although the ME modelling approach in studies to assess children's exposure to air pollution is highly encouraged, a validation process is needed, due to the uncertainties associated with the application of this approach.
Collapse
Affiliation(s)
- P T B S Branco
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - M C M Alvim-Ferraz
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - F G Martins
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - S I V Sousa
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
| |
Collapse
|
19
|
Franck U, Leitte AM, Suppan P. Multiple exposures to airborne pollutants and hospital admissions due to diseases of the circulatory system in Santiago de Chile. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 468-469:746-56. [PMID: 24064344 DOI: 10.1016/j.scitotenv.2013.08.088] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 07/23/2013] [Accepted: 08/27/2013] [Indexed: 05/27/2023]
Abstract
BACKGROUND High concentrations of various air pollutants have been associated with hospitalization due to development and exacerbation of cardiovascular diseases. OBJECTIVES We aimed to assess associations between airborne exposures by particulate matter as well as gaseous air pollutants and hospital admissions due to different cardiovascular disease groups in Santiago de Chile. METHODS The study was performed in the metropolitan area of Santiago de Chile during 2004-2007. We applied a time-stratified case-crossover analysis taking temporal variation, meteorological conditions and autocorrelation into account. We computed associations between daily ambient concentrations of carbon monoxide (CO), nitrogen dioxide (NO2), particulate matter (PM10 and PM2.5--particulate matter with aerodynamic diameters less than 10 or 2.5 μm, respectively) or ozone (O3) and hospital admissions for cardiovascular illnesses. RESULTS We found for CO, NO2, PM10 and PM2.5 adverse relationships to cardiovascular admissions while effect strength and lag depended on the pollutant and on the disease group. By trend, in 1-pollutant models most adverse pollutants were NO2 and particulate matter (PM10 and PM2.5) followed by CO, while in 2-pollutant models effects of PM10 persisted in most cases whereas other effects weakened. In addition the strongest effects seemed to be immediate or with a delay of up to 2 days. Adverse effects of ozone could not be detected. CONCLUSIONS Our results provided evidence for adverse health effects of combined exposure to airborne pollutants. Different pollutants accounted for varying adverse effects within different cardiovascular disease groups. Taking case numbers and effect strength of all cardiovascular diseases into account, mitigation measures should address all pollutants but especially NO2, PM10, and CO.
Collapse
Affiliation(s)
- Ulrich Franck
- Core Facility Studies, Helmholtz Centre for Environmental Research-UFZ, Leipzig, Germany.
| | | | | |
Collapse
|
20
|
Cakmak S, Dales RE, Vida CB. Components of Particulate Air Pollution and Mortality in Chile. INTERNATIONAL JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HEALTH 2013; 15:152-8. [DOI: 10.1179/oeh.2009.15.2.152] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
|
21
|
Jhun I, Oyola P, Moreno F, Castillo MA, Koutrakis P. PM2.5 mass and species trends in Santiago, Chile, 1998 to 2010: the impact of fuel-related interventions and fuel sales. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2013; 63:161-169. [PMID: 23472300 DOI: 10.1080/10962247.2012.742027] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
UNLABELLED Improving air quality in Santiago has been a high priority for the Chilean government. In this paper we examine trends of fine particulate matter (PM2.5) mass and species concentrations during the period 1998 to 2010 and explore the impact of fuel-related interventions and fuel sales on concentration changes. Smoothing spline functions were utilized to characterize and account for nonlinear relationships between pollutant concentrations and different parameters. Meteorology-adjusted PM2.5 concentrations were lower by 21.8 microg/m3 in 2010 compared to 1998. In this model, wind speed was the most important determinant of PM2.5 levels. A decrease in 24-hr average wind speed below 1.0 m/s was associated with a significant increase in daily PM2.5 levels, indicating a high sensitivity of PM2.5 concentrations to the accumulation of local emissions. The same regression model framework was applied to examine the trends of lead, bromine, and sulfur concentrations. Removal of lead and bromine from gasoline achieved dramatic decreases in their atmospheric concentrations. Nonetheless, both elements continue to persist, likely in the form of PbBrCl. The reduction of diesel sulfur content from 1,500 to 50 ppm corresponded to a 32% decrease in particulate sulfur levels. Lastly, a surge in PM2.5 was observed in 2005-2008. Further regression analyses suggested this was prompted by a rise in monthly petroleum-based fuel sales. IMPLICATIONS In this paper, we elucidate meteorology-adjusted trends of PM2.5 mass and species concentrations in Santiago and assess the efficacy of fuel-related interventions, such as the removal of lead from gasoline and reduction of sulfur content in diesel. In addition, we explore the impact of fuel sales on PM2.5 trends. Given that fuel consumption is likely to increase further in this rapidly growing city, understanding its impact on PM2.5 trends can inform future air quality control efforts in Santiago.
Collapse
Affiliation(s)
- Iny Jhun
- Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, USA.
| | | | | | | | | |
Collapse
|
22
|
Dales RE, Cakmak S, Vidal CB, Rubio MA. Air pollution and hospitalization for acute complications of diabetes in Chile. ENVIRONMENT INTERNATIONAL 2012; 46:1-5. [PMID: 22647388 DOI: 10.1016/j.envint.2012.05.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 05/06/2012] [Accepted: 05/07/2012] [Indexed: 06/01/2023]
Abstract
Exposure to air pollution has been shown to cause insulin resistance in mice. To determine the relevance to humans, we tested the association between daily air pollution concentrations and daily hospitalization for acute serious complications of diabetes, coma and ketoacidosis, in Santiago between 2001 and 2008, using generalized linear models with natural splines to control for long term trends. For an interquartile range (IQR) increase in air pollutant, the relative risks (95% CI) of hospitalization for diabetes were: 1.15 (1.10, 1.20) for carbon monoxide (IQR=1.00); 1.07 (0.98, 1.16) for ozone (IQR=63.50); 1.14 (1.06, 1.22) for sulfur dioxide (IQR=5.88); 1.12(1.05, 1.20) for nitrogen dioxide (IQR=27.94); 1.11 (1.07, 1.15) for particulate matter≤10 μm diameter(IQR=34.00); and 1.11 (1.06, 1.16) for fine particulate matter ≤2.5 μm diameter (IQR=18.50). Results were similar when stratified by age, sex and season. Air pollution appears to increase the risk of acute complications of diabetes requiring hospitalization, suggesting that improvements in air quality may reduce morbidity from diabetes.
Collapse
Affiliation(s)
- Robert E Dales
- Health Canada, University of Ottawa Departments of Medicine and Epidemiology, The Ottawa Hospital (General Campus), 501 Smyth Road, Box 211, Ottawa, ON, K1H 8L6, Canada
| | | | | | | |
Collapse
|
23
|
Muñoz RC. Relative roles of emissions and meteorology in the diurnal pattern of urban PM10: analysis of the daylight saving time effect. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2012; 62:642-650. [PMID: 22788102 DOI: 10.1080/10962247.2012.665147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Daylight saving time (DST) is a common practice in many countries, in which Official Time (OT) is abruptly shifted 1 hour with respect to solar time on two occasions every year (in fall and spring). All anthropogenic emitting processes tied to OT like job and school commuting traffic, abruptly change in this moment their timing with respect to solar time, inducing a sudden shift between emissions and the meteorological factors that control the dispersion and transport of air pollutants. Analyzing 13 years of hourly particulate matter (PM10) concentrations measured in Santiago, Chile, we demonstrate that the DST practice has observable non-trivial effects in the PM10 diurnal cycle. The clearest impact is in the morning peak of PM10 during the fall DST change, which occurs later and has on average a significant smaller magnitude in the days after the DST change as compared to the days before it. This decrease in magnitude is most remarkable because it occurs in a period of the year when overall PM10 concentrations increase due to generally worsening of the dispersion conditions. Results are shown for seven monitoring stations around the city, and for the fall and spring DST changes. They show clearly the interplay of emissions and meteorology in conditioning urban air pollution problems, highlighting the role of the morning and evening transitions of the atmospheric boundary layer in shaping the diurnal pattern of urban air pollutant concentrations.
Collapse
Affiliation(s)
- Ricardo C Muñoz
- Department of Geophysics, University of Chile, Av. Blanco Encalada 2002, Santiago, Chile.
| |
Collapse
|
24
|
Delgado-Saborit JM. Use of real-time sensors to characterise human exposures to combustion related pollutants. ACTA ACUST UNITED AC 2012; 14:1824-37. [DOI: 10.1039/c2em10996d] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
25
|
Chen C, Zhao B. Review of relationship between indoor and outdoor particles: I/O ratio, infiltration factor and penetration factor. ATMOSPHERIC ENVIRONMENT 2011; 45:275-288. [DOI: 10.1016/j.atmosenv.2010.09.048] [Citation(s) in RCA: 308] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
|
26
|
Raaschou-Nielsen O, Sørensen M, Hertel O, Chawes BLK, Vissing N, Bønnelykke K, Bisgaard H. Predictors of indoor fine particulate matter in infants' bedrooms in Denmark. ENVIRONMENTAL RESEARCH 2011; 111:87-93. [PMID: 21059467 DOI: 10.1016/j.envres.2010.10.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Revised: 10/18/2010] [Accepted: 10/20/2010] [Indexed: 05/30/2023]
Abstract
BACKGROUND Particulate matter (PM) in ambient air is responsible for adverse health effects in adults and children. Relatively little is known about the concentrations, sources and health effects of PM in indoor air. OBJECTIVE To identify sources of fine PM in infants' bedrooms. METHODS We conducted 1122 measurements of fine PM (PM(2.5) and black smoke) in the bedrooms of 389 infants and registered indoor activities and characteristics of the house. We used mixed models to identify and quantify associations between predictors and concentrations. RESULTS The concentration of PM(2.5) was 2.8 times (95% confidence interval [CI], 1.4-5.5 times) higher in houses where people smoked; the concentration increased by 19% (95% CI, 15-23%) per doubling of the amount of tobacco smoked and decreased by 16% (95% CI, 9-27%) per 5-m increase in the distance between the smoking area and the infant's bedroom. Frying without a range hood was associated with a 32% (95% CI, 12-54%) higher PM(2.5) concentration per time per day, whereas frying with use of a range hood did not increase the concentration in the infant's bedroom. Use of a fireplace, stove, candles or vacuum-cleaner, interior rebuilding or renovation, local traffic, inner city residence and cold season increased the fine PM concentration. Open windows decreased the PM(2.5) concentration in homes with smokers but increased the concentration in non-smoking homes. CONCLUSIONS We identified several sources of fine PM in infants' bedrooms. The concentrations can be reduced by use of a range hood for frying, by not using candles, a fireplace or a stove, by increasing the distance between the bedroom and the smoking area and by opening windows in houses of smokers. Smoking is a strong predictor of fine PM in infants' bedrooms and should be avoided.
Collapse
Affiliation(s)
- Ole Raaschou-Nielsen
- Institute of Cancer Epidemiology, Danish Cancer Society, Strandboulevarden 49, 2100 Copenhagen, Denmark.
| | | | | | | | | | | | | |
Collapse
|
27
|
Cakmak S, Dales RE, Vidal CB. Air pollution and hospitalization for epilepsy in Chile. ENVIRONMENT INTERNATIONAL 2010; 36:501-5. [PMID: 20452673 DOI: 10.1016/j.envint.2010.03.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Revised: 03/23/2010] [Accepted: 03/25/2010] [Indexed: 05/03/2023]
Abstract
OBJECTIVE To determine the association between gaseous and fine particulate air pollution (PM(2.5)) and epilepsy in a general population sample. METHOD A daily time-series analyses tested the association between daily hospitalization for epilepsy in seven Chilean urban centers during the period 2001 and 2005. Results were adjusted for long term trends, day-of-the-week, and average humidex on the day of hospitalization and the day before. RESULTS Pooled city estimates of relative risk (95% CI) of hospitalization for epilepsy associated with changes in pollutant concentrations equivalent to their interquartile range were: 1.098(1.045, 1.155) for carbon monoxide (CO); 1.100 (1.025, 1.181) for ozone O(3); 1.085 (1.03, 1.144) for sulfur dioxide (SO(2)); 1.108 (1.021, 1.204) for nitrogen dioxide (NO(2)); 1.083(1.038, 1.13) for particulate matter <or= 10 microm diameter (PM(10)); and 1.065(1.002, 1.132) for fine particulate matter <or=2.5 microm diameter (PM(2.5)). These results were not significantly influenced by age, sex, or season. INTERPRETATION Air pollution may be a risk factor for hospitalization for epilepsy.
Collapse
Affiliation(s)
- Sabit Cakmak
- Health Canada, Ottawa, Canada, Department of Statistics, Ottawa Health Research Institute, Ottawa, ON, Canada.
| | | | | |
Collapse
|
28
|
Dales RE, Cakmak S, Vidal CB. Air pollution and hospitalization for venous thromboembolic disease in Chile. J Thromb Haemost 2010; 8:669-74. [PMID: 20088925 DOI: 10.1111/j.1538-7836.2010.03760.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Ambient air pollution is a risk factor for stroke and myocardial infarction, possibly because of alterations in coagulation that influence the arterial circulation. Whether air pollution influences diseases associated with peripheral venous thrombogenesis remains largely unknown. OBJECTIVES To determine the association between air pollution and venous thromboembolic disease (VTE) in a sample of the general population. METHODS A time-series analysis was used to test the association between daily air pollution and VTE hospitalizations in Santiago between 2001 and 2005. Results were adjusted for long-term trends, day of the week and average daily humidex. RESULTS From a population of 5.4 million, there were, on average, 2.3 admissions for VTE per day. Pooled estimates of relative risk (RR) [95% confidence interval (CI)] of hospitalization for venous disease were: 1.07 (1.05, 1.09) for a 58.4 p.p.b. increase in ozone (O(3)); 1.06 (1.02, 1.09) for a 5.85 p.p.b. increase in sulphur dioxide (SO(2)); 1.08 (1.03, 1.12) for a 29.25 microg/m(3) increase in nitrogen dioxide (NO(2)); and 1.05 (1.03, 1.06) for a 20.02 microg/m(3) increase in particulate matter < or = 2.5 microm in mean aerodynamic diameter (PM(2.5)). For pulmonary embolism (PE) results were: 1.10 (1.07, 1.13) for O(3); 1.05 (1.02, 1.08) for SO(2); 1.07 (1.04, 1.09) for NO(2); and 1.05(1.03, 1.06) for PM(2.5), respectively. CONCLUSION Air pollution appears to be a risk factor for venous thrombosis and PE, a disease with a significant fatality rate.
Collapse
Affiliation(s)
- R E Dales
- (Epidemiology) Health Canada, University of Ottawa Department of Medicine, The Ottawa Hospital (General Campus), Ottawa, ON, Canada
| | | | | |
Collapse
|
29
|
Pekey B, Bozkurt ZB, Pekey H, Doğan G, Zararsiz A, Efe N, Tuncel G. Indoor/outdoor concentrations and elemental composition of PM10/PM2.5 in urban/industrial areas of Kocaeli City, Turkey. INDOOR AIR 2010; 20:112-25. [PMID: 20002793 DOI: 10.1111/j.1600-0668.2009.00628.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study presents indoor/outdoor PM2.5 and PM10 concentrations measured during winter and summer in 15 homes in Kocaeli, which is one of the most industrialized areas in Turkey. Indoor and outdoor PM2.5 and PM10 mass concentrations and elemental composition were determined using an X-ray fluorescence spectrometer. Quantitative information was obtained on mass concentrations and other characteristics such as seasonal variation, indoor/outdoor (I/O) ratio, PM2.5/PM10 ratio, correlations and sources. Average indoor and outdoor PM2.5 concentrations were 29.8 and 23.5 microg/m(3) for the summer period, and 24.4 and 21.8 microg/m(3) for the winter period, respectively. Average indoor and outdoor PM10 concentrations were 45.5 and 59.9 microg/m(3) for the summer period, and 56.9 and 102.3 microg/m(3) for the winter period, respectively. A varimax rotated factor analysis (FA) was performed separately on indoor and outdoor datasets in an effort to identify possible heavy metal sources of PM2.5 and PM10 particle fractions. FA of outdoor data produced source categories comprising polluted soil, industry, motor vehicles, and fossil fuel combustion for both PM fractions, while source categories determined for indoor data for both PM2.5 and PM10 comprised industry, polluted soil, motor vehicles, and smoking, with an additional source category of cooking activities detected for the PM2.5 fraction. Practical Implications In buildings close to industrial areas or traffic arteries, outdoor sources may have an important effect on indoor air pollution. Therefore, indoor and outdoor investigations should be conducted simultaneously to assess the relationship between indoor and outdoor pollution. This study presents the simultaneous measurement of PM fractions (PM2.5 and PM10) and their elemental compositions to determine the sources of respirable PM and the heavy metals bound to these particles in indoor air. Factor analysis of indoor data indicated that the contribution of outdoor pollutant sources to indoor pollution was about 70%, making these sources the most significant for indoor heavy metal pollution, wheras other sources of indoor pollution included smoking and cooking activities.
Collapse
Affiliation(s)
- B Pekey
- Department of Environmental Engineering, Kocaeli University, Kocaeli 41380, Turkey.
| | | | | | | | | | | | | |
Collapse
|
30
|
Hwang BF, Lee YL. Air pollution and prevalence of bronchitic symptoms among children in Taiwan. Chest 2010; 138:956-64. [PMID: 20299625 DOI: 10.1378/chest.09-2600] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND There were limited studies concerning ambient air pollution exposure on development of bronchitic symptoms among children. These studies provided suggestive but inconclusive results. Therefore, the objective of this study is to assess the association between air pollutants and the prevalence of bronchitic symptoms in the Taiwan Children Health Study. METHODS We conducted a nationwide cross-sectional study of 5,049 Taiwanese children in 2007. Routine air pollution monitoring data were used for sulfur dioxide (SO(2)), nitrogen dioxides (NO(2)), ozone (O(3)), carbon monoxide (CO), and particles with an aerodynamic diameter ≤ 2.5 μm (PM(2.5)). The exposure parameters were calculated using the between-community 3-year average concentration. The effect estimates were presented as odds ratios (ORs) per interquartile changes for SO(2), NO(2), O(3), CO, and PM(2.5). RESULTS In the two-stage hierarchical model adjusting for confounding, the prevalence of bronchitic symptoms with asthma was positively associated with the between-community 3-year average concentrations of NO(2) (adjusted OR, 1.81 per 8.79 ppb; 95% CI, 1.14-2.86), and CO (OR, 1.31 per 105 ppb; 95% CI, 1.04-1.64). The prevalence of phlegm with no asthma was related to O(3) (OR, 1.32 per 8.77 ppb; 95% CI, 1.06-1.63). CONCLUSIONS The results suggest that long-term exposure to outdoor air pollutants, such as NO(2), CO, and O(3), may increase the prevalence of bronchitic symptoms among children.
Collapse
Affiliation(s)
- Bing-Fang Hwang
- Department of Occupational Safety and Health, College of Public Health, China Medical University, Taichung, Taiwan
| | | |
Collapse
|
31
|
Abstract
The authors performed a time-series analysis to test the association between air pollution and daily numbers of hospitalizations for headache in 7 Chilean urban centers during the period 2001–2005. Results were adjusted for day of the week and humidex. Three categories of headache—migraine, headache with cause specified, and headache not otherwise specified—were all associated with air pollution. Relative risks for migraine associated with interquartile-range increases in specific air pollutants were as follows: 1.11 (95% confidence interval (CI): 1.06, 1.17) for a 1.15-ppm increase in carbon monoxide; 1.11 (95% CI: 1.06, 1.17) for a 28.97-μg/m3 increase in nitrogen dioxide; 1.10 (95% CI: 1.04, 1.17) for a 6.20-ppb increase in sulfur dioxide; 1.17 (95% CI: 1.08, 1.26) for a 69.51-ppb increase in ozone; 1.11 (95% CI: 1.00, 1.19) for a 21.51-μg/m3 increase in particulate matter less than 2.5 μm in aerodynamic diameter (PM2.5); and 1.10 (95% CI: 1.04, 1.15) for a 37.79-μg/m3 increase in particulate matter less than 10 μm in aerodynamic diameter (PM10). There was no significant effect modification by age, sex, or season. The authors conclude that air pollution appears to increase the risk of headache in Santiago Province. If the relation is causal, the morbidity associated with headache should be considered when estimating the burden of illness and costs associated with poor air quality.
Collapse
Affiliation(s)
- Robert E Dales
- Division of Statistics, Health Canada, Ottawa, Ontario, Canada
| | | | | |
Collapse
|
32
|
McKone TE, Ryan PB, Ozkaynak H. Exposure information in environmental health research: current opportunities and future directions for particulate matter, ozone, and toxic air pollutants. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2009; 19:30-44. [PMID: 18385670 DOI: 10.1038/jes.2008.3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Accepted: 01/04/2008] [Indexed: 05/26/2023]
Abstract
Understanding and quantifying outdoor and indoor sources of human exposure are essential but often not adequately addressed in health effect studies for air pollution. Air pollution epidemiology, risk assessment, health tracking, and accountability assessments are examples of health effect studies that require but often lack adequate exposure information. Recent advances in exposure modeling along with better information on time-activity and exposure factor data provide us with unique opportunities to improve the assignment of exposures for both future and ongoing studies linking air pollution to health impacts. In September 2006, scientists from the US Environmental Protection Agency and the Centers for Disease Control and Prevention along with scientists from the academic community and state health departments convened a symposium on air pollution exposure and health to identify, evaluate, and improve current approaches for linking air pollution exposures to disease. This manuscript presents the key issues, challenges, and recommendations identified by the exposure working group, who used case studies of particulate matter, ozone, and toxic air-pollutant exposure to evaluate health effects for air pollution. One of the overarching lessons of this workshop is that obtaining better exposure information for these different health effect studies requires both goal setting for what is needed and mapping out the transition pathway from current capabilities for meeting these goals. Meeting our long-term goals requires definition of incremental steps that provide useful information for the interim and move us toward our long-term goals. Another overarching theme among the three different pollutants and the different health study approaches is the need for integration among alternate exposure-assessment approaches. For example, different groups may advocate exposure indicators, biomonitoring, mapping methods (GIS), modeling, environmental media monitoring, and/or personal exposure modeling. However, emerging research reveals that the greatest progress comes from integration among two or more of these efforts.
Collapse
Affiliation(s)
- Thomas E McKone
- Lawrence Berkeley National Laboratory, Berkeley, California 95720, USA.
| | | | | |
Collapse
|
33
|
Cakmak S, Dales RE, Gultekin T, Vidal CB, Farnendaz M, Rubio MA, Oyola P. Components of particulate air pollution and emergency department visits in Chile. ARCHIVES OF ENVIRONMENTAL & OCCUPATIONAL HEALTH 2009; 64:148-155. [PMID: 19864216 DOI: 10.1080/19338240903240228] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The objective of the present study was to determine the association between several elements of particulates and Emergency Department (ED) visits in a general population sample. Daily time-series analyses tested the association between daily ED visit and air pollutants and components of particulates measured in Santiago Centro, a municipality, which includes downtown Santiago during the period from 2001 to 2006. The strongest individual effect was seen for elemental carbon. A 4.76 microg/m3 increase was associated with a relative risk (RR) of 1.12 (95% confidence interval [CI] = 1.10-1.14) increase in total ED visits, and a RR of 1.18 (95% CI = 1.16-1.21) for respiratory ED visit. Using factor analysis, the authors determined that traffic combustion-related particulates were significantly associated with ED visits. Among all the sources identified, traffic combustion-related particulates had the strongest association with ED visits. A factor indicating soil-sourced particles had a weaker but statistically significant observed morbidity effect. Of the many components of particulate air pollution, those from motor vehicle exhaust had the greatest observed effect on morbidity.
Collapse
Affiliation(s)
- Sabit Cakmak
- Department of Statistics at Health Canada, Ottawa, Canada. sabit
| | | | | | | | | | | | | |
Collapse
|
34
|
|
35
|
Yu CH, Morandi MT, Weisel CP. Passive dosimeters for nitrogen dioxide in personal/indoor air sampling: a review. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2008; 18:441-51. [PMID: 18446185 PMCID: PMC4429295 DOI: 10.1038/jes.2008.22] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2007] [Accepted: 02/21/2008] [Indexed: 05/22/2023]
Abstract
Accurate measurement of nitrogen dioxide concentrations in both outdoor and indoor environments, including personal exposures, is a fundamental step for linking atmospheric nitrogen dioxide levels to potential health and ecological effects. The measurement has been conducted generally in two ways: active (pumped) sampling and passive (diffusive) sampling. Diffusion samplers, initially developed and used for workplace air monitoring, have been found to be useful and cost-effective alternatives to conventional pumped samplers for monitoring ambient, indoor and personal exposures at the lower concentrations found in environmental settings. Since the 1970s, passive samplers have been deployed for ambient air monitoring in urban and rural sites, and to determine personal and indoor exposure to NO2. This article reviews the development of NO2 passive samplers, the sampling characteristics of passive samplers currently available, and their application in ambient and indoor air monitoring and personal exposure studies. The limitations and advantages of the various passive sampler geometries (i.e., tube, badge, and radial type) are also discussed. This review provides researchers and risk assessors with practical information about NO2 passive samplers, especially useful when designing field sampling strategies for exposure and indoor/outdoor air sampling.
Collapse
Affiliation(s)
- Chang Ho Yu
- Exposure Science Division, Environmental and Occupational Health Sciences Institute, Piscataway, New Jersey, USA
| | - Maria T. Morandi
- School of Public Health, University of Texas HCS, Houston, Texas, USA
| | - Clifford P. Weisel
- Exposure Science Division, Environmental and Occupational Health Sciences Institute, Piscataway, New Jersey, USA
| |
Collapse
|
36
|
Ajmone-Marsan F, Biasioli M, Kralj T, Grcman H, Davidson CM, Hursthouse AS, Madrid L, Rodrigues S. Metals in particle-size fractions of the soils of five European cities. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2008; 152:73-81. [PMID: 17602808 DOI: 10.1016/j.envpol.2007.05.020] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2007] [Revised: 05/09/2007] [Accepted: 05/11/2007] [Indexed: 05/16/2023]
Abstract
Soils from Aveiro, Glasgow, Ljubljana, Sevilla and Torino have been investigated in view of their potential for translocation of potentially toxic elements (PTE) to the atmosphere. Soils were partitioned into five size fractions and Cr, Cu, Ni, Pb and Zn were measured in the fractions and the whole soil. All PTE concentrated in the <10 microm fraction. Cr and Ni concentrated also in the coarse fraction, indicating a lithogenic contribution. An accumulation factor (AF) was calculated for the <2 and <10 microm fraction. The AF values indicate that the accumulation in the finer fractions is higher where the overall contamination is lower. AF for Cr and Ni are particularly low in Glasgow and Torino. An inverse relationship was found between the AF of some metals and the percentage of <10 microm particles that could be of use in risk assessment or remediation practices.
Collapse
Affiliation(s)
- F Ajmone-Marsan
- DIVAPRA, Chimica Agraria, Università di Torino, Via Leonardo da Vinci, 44, 10095 Grugliasco, TO, Italy.
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Emmelin A, Wall S. Indoor air pollution: a poverty-related cause of mortality among the children of the world. Chest 2008; 132:1615-23. [PMID: 17998361 DOI: 10.1378/chest.07-1398] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
This article reviews the research on the relation between indoor air pollution exposure and acute respiratory infection (ARI) in children in developing countries. ARI is a cause of death globally, causing approximately 19% of all deaths before the age of 5 years, according to a World Health Organization estimate. Indoor air pollution from biomass fuels, which is strongly poverty related, has long been regarded as an important risk factor for ARI morbidity and mortality. The empirical base for this view is comparatively narrow, with few empirical studies in relation to the magnitude of the global public health importance of the problem. Most existing reports consistently indicate that indoor air pollution is indeed a risk factor for ARI, but studies are generally small and use indirect indicators of pollution, such as use of biomass fuel or type of stove. Exposure assessment for indoor air pollution in developing countries is recognized as a major obstacle because of high cost and infrastructural limitations to chemical pollution sampling. Use of proxy indicators without measurement support may increase the risk of both misclassification of exposure and of confounding by other poverty-related factors. The issue of sufficient sample size further underlines the need for decisions to invest in this research field. Areas where further research is needed also include exploring qualitatively options for interventions that are culturally and economically acceptable to local communities.
Collapse
Affiliation(s)
- Anders Emmelin
- Division of Epidemiology and Public Health Sciences, Department of Public Health and Clinical Medicine, Umeå University, SE-901 85 Umeå, Sweden.
| | | |
Collapse
|
38
|
Cakmak S, Dales RE, Vidal CB. Air pollution and mortality in Chile: susceptibility among the elderly. ENVIRONMENTAL HEALTH PERSPECTIVES 2007; 115:524-7. [PMID: 17450219 PMCID: PMC1852651 DOI: 10.1289/ehp.9567] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2006] [Accepted: 01/08/2007] [Indexed: 05/09/2023]
Abstract
OBJECTIVE The estimated mortality rate associated with ambient air pollution based on general population studies may not be representative of the effects on certain subgroups. The objective of the present study was to determine the influence of relatively high concentrations of air pollution on mortality in a general population sample and in the very elderly. STUDY DESIGN Daily time-series analyses tested the association between daily air pollution and daily mortality in seven Chilean urban centers during 1997-2003. Results were adjusted for day of the week and humidex. RESULTS Daily averaged particulate matter with aerodynamic matter < 10 microm (PM(10)) was 84.88 microg/m(3), sulfur dioxide was 14.08 ppb, and carbon monoxide was 1.29 ppb. The 1-hr maximum ozone was 100.13 ppb. The percentage increases in nonaccidental mortality associated with an increase in PM(10) equivalent to its mean were 4.53 (t-ratio 1.52) for those < 65 years and 14.03 (3.87) for those > 85 years. Respective values were 4.96 (1.17) and 8.56 (2.02) for O(3); 4.77 (2.50) and 7.92 (3.23) for SO(2); and 4.10 (2.52) and 8.58 (4.45) for CO. CONCLUSION Our results suggest that the very elderly are particularly susceptible to dying from air pollution. Concentrations deemed acceptable for the general population may not adequately protect the very elderly.
Collapse
Affiliation(s)
- Sabit Cakmak
- Department of Statistics, Health Canada, Ottawa, Ontario, Canada
| | - Robert E. Dales
- Department of Epidemiology, University of Ottawa, Ontario, Canada
- Address correspondence to R.E. Dales, The Ottawa Hospital (General Campus), 501 Smyth Rd., Box 211, Ottawa, Ontario, Canada K1H 8L6. Telephone: (613) 737-8198. Fax: (613) 737-8537. E-mail:
| | - Claudia Blanco Vidal
- Area Descontaminacion Atmosferica, Comisión Nacional del Medio Ambiente (CONAMA), Metropolitana De Santiago, Chile
| |
Collapse
|
39
|
Kim D, Sass-Kortsak A, Purdham JT, Dales RE, Brook JR. Associations between personal exposures and fixed-site ambient measurements of fine particulate matter, nitrogen dioxide, and carbon monoxide in Toronto, Canada. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2006; 16:172-83. [PMID: 16175198 DOI: 10.1038/sj.jea.7500446] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A longitudinal study investigating personal exposures to PM(2.5), nitrogen dioxide (NO(2)), and carbon monoxide (CO) for cardiac compromised individuals was conducted in Toronto, Canada. The aim of the study was (1) to examine the distribution of exposures to PM(2.5), NO(2), and CO; and (2) to investigate the relationship between personal exposures and fixed-site ambient measurements of PM(2.5), NO(2), and CO. In total, 28 subjects with coronary artery disease wore the Rupprecht & Patashnick ChemPass Personal Sampling System one day a week for a maximum of 10 weeks. The mean (SD) personal exposures were 22 microg m(-3) (42), 14 p.p.b. (6), and 1.4 p.p.m (0.5) for PM(2.5), NO(2), and CO, respectively. PM(2.5) and CO personal exposures were greater than central fixed-site ambient measurements, while the reverse pattern was observed for NO(2). Ambient PM(2.5) and NO(2) were correlated with personal exposures to PM(2.5) and NO(2) with median Spearman's correlation coefficients of 0.69 and 0.57, respectively. The correlations between personal exposures and ambient measurements made closest to the subjects' homes or the average of all stations within the study were not stronger than the correlation between personal exposures and central fixed-site measurements. Personal exposures to PM(2.5) were correlated with personal exposures to NO(2) (median Spearman's correlation coefficient of 0.43). This study suggests that central fixed-site measurements of PM(2.5) and NO(2) may be treated as surrogates for personal exposures to PM(2.5) and NO(2) in epidemiological studies, and that NO(2) is a potential confounder of PM(2.5).
Collapse
Affiliation(s)
- David Kim
- Department of Environmental Sciences and Engineering, The University of North Carolina at Chapel Hill, North Carolina 27599-7431, USA
| | | | | | | | | |
Collapse
|
40
|
Setton EM, Hystad PW, Keller CP. Opportunities for using spatial property assessment data in air pollution exposure assessments. Int J Health Geogr 2005; 4:26. [PMID: 16262893 PMCID: PMC1277841 DOI: 10.1186/1476-072x-4-26] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2005] [Accepted: 10/31/2005] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Many epidemiological studies examining the relationships between adverse health outcomes and exposure to air pollutants use ambient air pollution measurements as a proxy for personal exposure levels. When pollution levels vary at neighbourhood levels, using ambient pollution data from sparsely located fixed monitors may inadequately capture the spatial variation in ambient pollution. A major constraint to moving toward exposure assessments and epidemiological studies of air pollution at a neighbourhood level is the lack of readily available data at appropriate spatial resolutions. Spatial property assessment data are widely available in North America and may provide an opportunity for developing neighbourhood level air pollution exposure assessments. RESULTS This paper provides a detailed description of spatial property assessment data available in the Pacific Northwest of Canada and the United States, and provides examples of potential applications of spatial property assessment data for improving air pollution exposure assessment at the neighbourhood scale, including: (1) creating variables for use in land use regression modelling of neighbourhood levels of ambient air pollution; (2) enhancing wood smoke exposure estimates by mapping fireplace locations; and (3) using data available on individual building characteristics to produce a regional air pollution infiltration model. CONCLUSION Spatial property assessment data are an extremely detailed data source at a fine spatial resolution, and therefore a source of information that could improve the quality and spatial resolution of current air pollution exposure assessments.
Collapse
Affiliation(s)
- Eleanor M Setton
- Spatial Sciences Research Laboratory, Geography Department, University of Victoria, PO BOX 3050 STN CSC, Victoria, B.C., V8W 3P5, Canada
| | - Perry W Hystad
- Spatial Sciences Research Laboratory, Geography Department, University of Victoria, PO BOX 3050 STN CSC, Victoria, B.C., V8W 3P5, Canada
| | - C Peter Keller
- Spatial Sciences Research Laboratory, Geography Department, University of Victoria, PO BOX 3050 STN CSC, Victoria, B.C., V8W 3P5, Canada
| |
Collapse
|
41
|
Hwang BF, Lee YL, Lin YC, Jaakkola JJK, Guo YL. Traffic related air pollution as a determinant of asthma among Taiwanese school children. Thorax 2005; 60:467-73. [PMID: 15923246 PMCID: PMC1747433 DOI: 10.1136/thx.2004.033977] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND There is evidence that long term exposure to ambient air pollution increases the risk of childhood asthma, but the role of different sources and components needs further elaboration. To assess the effect of air pollutants on the risk of asthma among school children, a nationwide cross sectional study of 32 672 Taiwanese school children was conducted in 2001. METHODS Routine air pollution monitoring data for sulphur dioxide (SO2), nitrogen oxides (NOx), ozone (O3), carbon monoxide (CO), and particles with an aerodynamic diameter of 10 microm or less (PM10) were used. Information on individual characteristics and indoor environments was from a parent administered questionnaire (response rate 93%). The exposure parameters were calculated using the mean of the 2000 monthly averages. The effect estimates were presented as odds ratios (ORs) per 10 ppb changes for SO2, NOx, and O3, 100 ppb changes for CO, and 10 microg/m3 changes for PM10. RESULTS In a two stage hierarchical model adjusting for confounding, the risk of childhood asthma was positively associated with O3 (adjusted OR 1.138, 95% confidence interval (CI) 1.001 to 1.293), CO (adjusted OR 1.045, 95% CI 1.017 to 1.074), and NOx (adjusted OR 1.005, 95% CI 0.954 to 1.117). Against our prior hypothesis, the risk of childhood asthma was weakly or not related to SO2 (adjusted OR 0.874, 95% CI 0.729 to 1.054) and PM10 (adjusted OR 0.934, 95% CI 0.909 to 0.960). CONCLUSIONS The results are consistent with the hypothesis that long term exposure to traffic related outdoor air pollutants such as NOx, CO, and O3 increases the risk of asthma in children.
Collapse
Affiliation(s)
- B-F Hwang
- Department of Health Care Administration, Diwan College of Management, Tainan, Taiwan
| | | | | | | | | |
Collapse
|
42
|
Hussain I, Jain VV, O'Shaughnessy P, Businga TR, Kline J. Effect of nitrogen dioxide exposure on allergic asthma in a murine model. Chest 2004; 126:198-204. [PMID: 15249463 DOI: 10.1378/chest.126.1.198] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
STUDY OBJECTIVES The purpose of this study was to examine the effects of NO(2), a major component of air pollution, on airway eosinophilic inflammation and bronchial hyperreactivity, using a mouse model of asthma. SETTING AND SUBJECTS BALB/c mice (eight mice per experimental group) were studied in a basic research laboratory at the University of Iowa. INTERVENTIONS Using a standard murine model of asthma, BALB/c mice were sensitized to ovalbumin (OVA) by intraperitoneal (IP) injections (days 1 and 7) and were challenged with aerosolized OVA (days 13 and 14). Some mice were exposed to NO(2) (2 ppm) in an exposure chamber for 24 h before undergoing OVA aerosol challenge. A control group was exposed to OVA alone. MEASUREMENTS AND RESULTS The outcomes assessed included airway inflammation, bronchial hyperreactivity to inhaled methacholine, and goblet cell hyperplasia. We found that NO(2) exposure modestly increased airway neutrophilia but not airway eosinophilia in OVA-exposed mice. These mice exhibited epithelial damage and loss of epithelial mucin. Surprisingly, nonspecific bronchial hyperreactivity (ie, enhanced pause index) was not increased, although baseline smooth muscle tone was increased (p < 0.05) in the mice exposed to NO(2). CONCLUSIONS These data indicate that relatively short-term (24 h) exposure to NO(2) causes epithelial damage, reduced mucin expression, and increased tone of respiratory smooth muscle. Reduced mucin production may be a mechanism of injury following long-term exposure to inhaled NO(2). Despite enhancing epithelial damage in OVA-exposed mice, NO(2) exposure does not otherwise alter the expression of allergen-induced airway responses.
Collapse
Affiliation(s)
- Iftikhar Hussain
- Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA
| | | | | | | | | |
Collapse
|
43
|
Watson JG, Chow JC, Edgerton SA. A Special Issue from the NARSTO Symposium on Tropospheric Aerosols. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2001; 51:1506-1507. [PMID: 28072242 DOI: 10.1080/10473289.2001.10464378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This dedicated issue of the Journal of the Air & Waste Management Association contains nine peer-reviewed scientific papers that were presented at the NARSTO Symposium on Tropospheric Aerosols: Science and Decisions in an International Community, held October 24-26, 2000, in Querétaro, Mexico.1 Other peer-reviewed papers2-9 appear in a companion issue of Science of the Total Environment to be published in February 2002. More than 130 papers were presented in platform and poster sessions at the meeting. Approximately 28% of the technical presentations dealt with topics from Mexico, and 15% related to Canada, with the remainder discussing U.S. and global topics.
Collapse
|