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Shen L, Diao Y, Zhao T, Gu X, Shi SS. Meteorological influence on persistent O 3 pollution events in Wuxi in the Yangtze River Delta, China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170484. [PMID: 38296078 DOI: 10.1016/j.scitotenv.2024.170484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 01/03/2024] [Accepted: 01/24/2024] [Indexed: 02/03/2024]
Abstract
The number of O3 pollution days indicates an overall increasing trend over 2014-2021 in Wuxi in the Yangtze River Delta, with the pollution concentrations of MDA8-O3 between 186 and 200 μg·m-3. Specifically, a total of 62 POPEs (persistent O3 pollution events), defined as episodes with 3 or more continuous O3 pollution days, were observed for the 8 years. Using a multi-linear regression model, we find that the meteorology can explain approximately 56.5 % of the O3 variations for the 8 years in Wuxi, with temperature being the most crucial meteorological factor, followed by relative humidity (RH) and wind speeds. High temperature, low RH, low wind speeds and downward airflows significantly correlate with POPE-O3 changes. Three types of synoptic circulations are further identified during the POPEs from 2014 to 2021 by the T-mode (T-PCA) classification method. The primary circulation patterns governing the interannual changes of POPEs are characterized by the largest positive anomalies of temperature and planetary boundary layer (PBL) height; moreover, a distinct vertical mixing process is observed with uplifting airflows in the convective PBL during the afternoon and sinking airflows in the stable PBL at night, which is incredibly conducive to the downward transport of O3 after its upward delivery during daytime and substantially contributes to midnight O3 at the surface. The other two circulation types are associated with uniform descending flows in the PBL; as a result, surface O3 accumulates only near the ground and decreases significantly at night due to the titration effect. This study systematically highlights the influence of critical meteorological factors regulated by different synoptic circulations on the POPE in Wuxi, which provides a scientific basis for pollution control and prediction.
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Affiliation(s)
- Lijuan Shen
- School of Atmosphere and Remote Sensing, Wuxi University, Wuxi 214105, China.
| | - Yiwei Diao
- School of Atmosphere and Remote Sensing, Wuxi University, Wuxi 214105, China
| | - Tianliang Zhao
- Key Laboratory for Aerosol-Cloud-Precipitation of the China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Xuesong Gu
- Wuxi Environmental Monitoring Center Station, Wuxi 214023, China
| | - Shuang Shuang Shi
- School of Atmosphere and Remote Sensing, Wuxi University, Wuxi 214105, China
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Wu H, Guo B, Guo T, Pei L, Jing P, Wang Y, Ma X, Bai H, Wang Z, Xie T, Chen M. A study on identifying synergistic prevention and control regions for PM 2.5 and O 3 and exploring their spatiotemporal dynamic in China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 341:122880. [PMID: 37944886 DOI: 10.1016/j.envpol.2023.122880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/18/2023] [Accepted: 11/04/2023] [Indexed: 11/12/2023]
Abstract
Air pollutants, notably ozone (O3) and fine particulate matter (PM2.5) give rise to evident adverse impacts on public health and the ecotope, prompting extensive global apprehension. Though PM2.5 has been effectively mitigated in China, O3 has been emerging as a primary pollutant, especially in summer. Currently, alleviating PM2.5 and O3 synergistically faces huge challenges. The synergistic prevention and control (SPC) regions of PM2.5 and O3 and their spatiotemporal patterns were still unclear. To address the above issues, this study utilized ground monitoring station data, meteorological data, and auxiliary data to predict the China High-Resolution O3 Dataset (CHROD) via a two-stage model. Furthermore, SPC regions were identified based on a spatial overlay analysis using a Geographic Information System (GIS). The standard deviation ellipse was employed to investigate the spatiotemporal dynamic characteristics of SPC regions. Some outcomes were obtained. The two-stage model significantly improved the accuracy of O3 concentration prediction with acceptable R2 (0.86), and our CHROD presented higher spatiotemporal resolution compared with existing products. SPC regions exhibited significant spatiotemporal variations during the Blue Sky Protection Campaign (BSPC) in China. SPC regions were dominant in spring and autumn, and O3-controlled and PM2.5-dominated zones were detected in summer and winter, respectively. SPC regions were primarily located in the northwest, north, east, and central regions of China, specifically in the Beijing-Tianjin-Hebei urban agglomeration (BTH), Shanxi, Shaanxi, Shandong, Henan, Jiangsu, Xinjiang, and Anhui provinces. The gravity center of SPC regions was distributed in the BTH in winter, and in Xinjiang during spring, summer, and autumn. This study can supply scientific references for the collaborative management of PM2.5 and O3.
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Affiliation(s)
- Haojie Wu
- College of Geomatics, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China; Shaanxi Key Laboratory of Environmental Monitoring and Forewarning of Trace Pollutants, Xi'an, Shaanxi, 710043, China
| | - Bin Guo
- College of Geomatics, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China.
| | - Tengyue Guo
- Department of Geological Engineering, Qinghai University, Xining, Qinghai, 810016, China
| | - Lin Pei
- School of Exercise and Health Sciences, Xi'an Physical Education University, Xi'an, Shaanxi, 710068, China
| | - Peiqing Jing
- State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, Hubei, 430072, China
| | - Yan Wang
- School of Geography and Tourism, Shaanxi Normal University, Xi'an, Shaanxi, 710119, China
| | - Xuying Ma
- College of Geomatics, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China
| | - Haorui Bai
- College of Geomatics, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China
| | - Zheng Wang
- College of Geomatics, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China
| | - Tingting Xie
- College of Geomatics, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China
| | - Miaoyi Chen
- College of Geomatics, Xi'an University of Science and Technology, Xi'an, Shaanxi, 710054, China
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Xiang S, Guo X, Kou W, Zeng X, Yan F, Liu G, Zhu Y, Xie Y, Lin X, Han W, Gao Y. Substantial short- and long-term health effect due to PM 2.5 and the constituents even under future emission reductions in China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 874:162433. [PMID: 36841405 DOI: 10.1016/j.scitotenv.2023.162433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Heavy pollution events of fine particulate matter (PM2.5) frequently occur in China, seriously affecting the human health. However, how meteorological factors and anthropogenic emissions affect PM2.5 and the major constituents, as well as the subsequent health effect, remains unclear. Here, based on regional climate and air quality models Weather Research and Forecasting (WRF) and Community Multiscale Air Quality (CMAQ), the PM2.5 and major constituents in China at present and mid-century under the carbon neutral scenario Shared Socioeconomic Pathways (SSP)1-2.6 are simulated. Due to anthropogenic emission reduction, concentrations of PM2.5 and the constituents decrease substantially in SSP1-2.6. The long-term exposure premature deaths at present are 2.23 million per year in mainland China, which is projected to increase by 76 % under SSP1-2.6 despite emission reduction, primarily attributable to aging which strikingly offsets the effect of air quality improvement. The number of annual premature deaths resulting from short-term exposure is 228,104 in mainland China at present, which is projected to decrease in the future. Using North China Plain as an example, we identify that among the major constituents of PM2.5, organic carbon leads to the most short-term exposure deaths considering the largest exposure-response coefficient. Regarding the abnormally meteorological conditions, we find, relative to low relative humidity (RH) and non-stagnation, the compound events, defined as concurrence of high RH and atmospheric stagnation, exhibit an amplified role inducing larger premature deaths compared to the additive effect of the individual event of high RH and atmospheric stagnation. This nonlinear effect occurs at both present and future, but diminished in future due to emission reductions. Our study highlights the importance of considering both the long- and short-term premature deaths associated with PM2.5 and the constituents, as well as the critical effect of extreme weather events.
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Affiliation(s)
- Shengnan Xiang
- Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, and Laoshan Laboratory, Qingdao 266100, China
| | - Xiuwen Guo
- Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, and Laoshan Laboratory, Qingdao 266100, China
| | - Wenbin Kou
- Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, and Laoshan Laboratory, Qingdao 266100, China
| | - Xinran Zeng
- Zhejiang Institute of Meteorological Sciences, Hangzhou 310008, China
| | - Feifan Yan
- Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, and Laoshan Laboratory, Qingdao 266100, China
| | - Guangliang Liu
- Shandong Provincial Key Laboratory of Computer Networks, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250101, China
| | - Yuanyuan Zhu
- China National Environmental Monitoring Centre, Beijing 100012, China
| | - Yang Xie
- School of Economics and Management, Beihang University, Beijing 100191, China
| | - Xiaopei Lin
- Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, and Laoshan Laboratory, Qingdao 266100, China
| | - Wei Han
- Department of Pulmonary and Critical Care Medicine, Qingdao Municipal Hospital, Qingdao University, Qingdao 266100, China
| | - Yang Gao
- Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, and Laoshan Laboratory, Qingdao 266100, China.
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Jeong CH, Hilker N, Wang JM, Debosz J, Healy RM, Sofowote U, Munoz T, Herod D, Evans GJ. Characterization of winter air pollutant gradients near a major highway. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 849:157818. [PMID: 35940272 DOI: 10.1016/j.scitotenv.2022.157818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 07/14/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Traffic-related air pollutants (TRAP) including nitric oxide (NO), nitrogen oxide (NOx), carbon monoxide (CO), ultrafine particles (UFP), black carbon (BC), and fine particulate matter (PM2.5) were simultaneously measured at near-road sites located at 10 m (NR10) and 150 m (NR150) from the same side of a busy highway to provide insights into the influence of winter time meteorology on exposure to TRAP near major roads. The spatial variabilities of TRAP were examined for ambient temperatures ranging from -11 °C to +19 °C under downwind, upwind, and stagnant air conditions. The downwind TRAP concentrations at NR10 were higher than the upwind concentrations by a factor of 1.4 for CO to 13 for NO. Despite steep downwind reductions of 38 % to 75 % within 150 m, the downwind concentrations at NR150 were still well above upwind concentrations. Near-road concentrations of NOx and UFP increased as ambient temperatures decreased due to elevated emissions of NOx and UFP from vehicles under colder temperatures. Traffic-related PM2.5 sources were identified using hourly PM2.5 chemical components including organic/inorganic aerosol and trace metals at both sites. The downwind concentrations of primary PM2.5 species related to tailpipe and non-tailpipe emissions at NR10 were substantially higher than the upwind concentrations by a factor of 4 and 32, respectively. Traffic-related PM2.5 sources accounted for almost half of total PM2.5 mass under downwind conditions, leading to a rapid change of PM2.5 chemical composition. Under stagnant air conditions, the concentrations of most TRAP and related PM2.5 including tailpipe emissions, secondary nitrate, and organic aerosol were comparable to, or even greater than, the downwind concentrations under windy conditions, especially at NR150. This study demonstrates that stagnant air conditions further widen the traffic-influenced area and people living near major roadways may experience increased risks from elevated exposure to traffic emissions during cold and stagnant winter conditions.
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Affiliation(s)
- Cheol-Heon Jeong
- Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto, Ontario, Canada.
| | - Nathan Hilker
- Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto, Ontario, Canada
| | - Jon M Wang
- Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto, Ontario, Canada; Air Monitoring and Transboundary Air Sciences Section, Ministry of the Environment, Conservation and Parks, Toronto, Ontario, Canada
| | - Jerzy Debosz
- Air Monitoring and Transboundary Air Sciences Section, Ministry of the Environment, Conservation and Parks, Toronto, Ontario, Canada
| | - Robert M Healy
- Air Monitoring and Transboundary Air Sciences Section, Ministry of the Environment, Conservation and Parks, Toronto, Ontario, Canada
| | - Uwayemi Sofowote
- Air Monitoring and Transboundary Air Sciences Section, Ministry of the Environment, Conservation and Parks, Toronto, Ontario, Canada
| | - Tony Munoz
- Air Monitoring and Transboundary Air Sciences Section, Ministry of the Environment, Conservation and Parks, Toronto, Ontario, Canada
| | - Dennis Herod
- Analysis and Air Quality Section, Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Ottawa, Ontario, Canada
| | - Greg J Evans
- Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto, Ontario, Canada
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Abstract
In order to study the characteristics and causes of ozone (O3) pollution in 16 cities of Yunnan Plateau, the methods of COD, backward trajectory and potential source contribution function (PSCF) were used to analyze the O3 concentrations from 2015 to 2020 of all state-controlled environmental monitoring stations in 16 cities of Yunnan. The results show that the O3 concentrations in Yunnan gradually increased from 2015 to 2019, and the concentration in 2020 was the lowest due to the COVID-19 pandemic. The peak O3 concentration appears in spring. The daily change trend is a typical single peak shape, the lowest value appears around 8: 00, and the highest value is between 15:00 and 16:00. High concentrations of O3 are from the cities of Zhaotong and Kunming in northeastern Yunnan, while low concentrations of O3 mainly occur in the southwest and northwest border areas. Temperature and relative humidity are two meteorological parameters that have significant effect on O3 concentration. Temperature has the best correlation with O3 in winter, and relative humidity has a better correlation with O3 in autumn and winter than in spring and summer. Finally, source analysis of O3 showed that local ozone precursor emission sources and long-distance transmission from South and Southeast Asia constituted the major contributions of O3 in Yunnan.
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