Perceived haze, stress, and negative emotions: An ecological momentary assessment study of the affective responses to haze

Role of metabolic risk factors in the relationship between ambient fine particulate matter and depressive symptoms: Evidence from a longitudinal population study

BACKGROUND

There is growing evidence indicating a connection between fine particulate matter (PM2.5) and depressive symptoms. Metabolic risk factors are critical determinants of depressive symptoms. However, the mediating role of these factors on the association between PM2.5 and depressive symptoms remains elusive. We aimed to investigate whether and to what extent metabolic risk factors mediated the link between long-term PM2.5 exposure and depressive symptoms.

METHODS

This study comprised 7794 individuals aged between 30 and 79 years who participated in two waves of the on-site surveys in the China Multi-Ethnic Cohort. Ambient PM2.5 concentrations were assessed utilizing a random forest method based on satellite data. We employed the Patient Health Questionnaire-9 to assess depressive symptoms at wave 2, and the overall as well as three sub-domain symptom scores (emotional, neurovegetative, and neurocognitive symptoms) were calculated. Three metabolic risk factors, including hypertension, diabetes, and dyslipidemia, were considered. Mediation analyses were conducted to assess the indirect effects of PM2.5 on depressive symptoms through metabolic risk factors.

RESULTS

We found a positive association between chronic exposure to ambient PM2.5 and overall depressive symptoms as well as the three sub-domains. In mediation analyses, metabolic risk factors partially mediated the associations of PM2.5 on depressive symptoms. The natural indirect effects (RR, 95% CI) of PM2.5 on overall, emotional, neurovegetative, and neurocognitive symptoms mediated through metabolic risk factors were 1.004(1.001, 1.007), 1.004 (1.001, 1.008), 1.004 (1.001, 1.007), and 1.003(0.999, 1.007), respectively. Larger indirect effects were found in elderly participants (mediated proportion, 29.3%), females (13.3%), and people who did not consume alcohol (19.6%).

CONCLUSIONS

Metabolic risk factors may act as mediators in the relationship between chronic PM2.5 exposure and depression. Treatment of metabolic risk factors may be an opportunity to reduce the burden of depression caused by long-term exposure to PM2.5.

Association between psychological pain and suicidal ideation among men with substance use disorder: a moderated mediation model

Previous studies have found that people with substance use disorder are associated with significantly higher odds of suicidal ideation than the general population. Psychological pain and emotional regulation are considered protective factors for suicidal ideation, but the interaction process is not clear. In this study, we investigated the effects of psychological pain on suicidal ideation and constructed a moderated mediation model. 445 men with substance use disorder in China were recruited to complete the Chinese version of the Psychological Pain Scale, Regulatory Emotional Self-efficacy Scale, Suicidal Ideation Scale, and Intolerance of Uncertainty Scale. The results demonstrated that psychological pain significantly and positively predicted suicidal ideation among people with substance use disorder, and that regulatory emotional self-efficacy played a mediating role between psychological pain and suicidal ideation. Intolerance of uncertainty moderated the top and bottom halves of the intermediate process paths. This study suggests that intolerance of uncertainty and regulatory emotional self-efficacy can be improved by interventions among people with substance use disorder, which in turn can reduce their suicidal ideation and improve quality of life.

The pain of breathing: how does haze pollution affect urban innovation?

In China, innovation plays an important role in achieving economic development with green growth, but innovation activities are inhibited by the spread of haze pollution (also called smog). Using panel data on 265 cities in China at the prefectural level from 2001 to 2018, this paper investigates the relationship between haze pollution and urban innovation. The conclusions are as follows. First, haze pollution has a significant inhibitory effect on urban innovation. After we consider endogeneity, eliminate extreme values, replace variables, and incorporate spatial correlation, we find that the negative impact of haze pollution on urban innovation still exists. Second, the channels through which haze pollution affects urban innovation are mainly attributed to production efficiency, willingness to consume, and entrepreneurial activity. Third, the inhibitory effect of haze pollution on innovation has a spatial spillover effect. Fourth, among the different regions in China, the most serious inhibitory effect of haze pollution on innovation is in the central region, while that of the eastern and western regions is insignificant. Moreover, across diverse Chinese cities, the significant inhibitory effects of haze pollution on innovation are mainly in cities that are abundant in natural resource. Accordingly, the efficient management of haze pollution is a critical prerequisite and effective guarantee for increasing urban innovation, such as promoting clean energy, strengthening technological innovation, and improving human capital.

Mindfulness and intimate relationship satisfaction in daily life: The role of empathy

This study examined the role of empathy in the relationship between mindfulness and intimate relationship satisfaction (IRS). Using ecological momentary assessment, 100 pairs of university students who were in relationships participated in the study. The participants were invited to complete a questionnaire measuring their current states of mindfulness, IRS, and empathy three times a day for 14 days. The results showed that empathy at the within-person level played a mediating role in the relationship between acceptance and IRS. Empathy at the within-person level also moderated the relationship between monitoring and IRS. Findings illustrated the vital role of empathy in an intimate relationship. Limitations of the study were discussed.

The Role of Environmental Tax in Alleviating the Impact of Environmental Pollution on Residents' Happiness in China

Background: Environmental tax has been implemented by the government in response to the demands of the residents to control environmental pollution. However, a tax has a wide effect on many interacting aspects of the society. It remains unknown whether enacting an environmental tax for the government can improve the residents' happiness. This study aimed to examine the impact of air and water pollution on residents' happiness and evaluate whether an environmental tax can alleviate the impact of air and water pollution on residents' happiness. Methods: Based on the 2015 Chinese General Social Survey Data, 28 provinces in China were divided into two categories according to their environmental tax rates: baseline-tax areas (n = 13) and high-tax areas (n = 15). The ordered probit model was used to analyze the impact of air and water pollution on the residents' happiness in baseline-tax areas and high-tax areas, respectively. The Chow Test was used to test whether the impact of environmental pollution on happiness was different between baseline-tax areas and high-tax areas. Results: The impact of air pollution on residents' happiness was statistically significant in the baseline-tax areas (coefficient -0.162, 95% confidence interval (CI) -0.239, -0.086, p < 0.001), but the significance was weakened in the high-tax areas (coefficient -0.030, 95% CI -0.060, 0.000, p = 0.051). The Chow Test showed that the absolute value of the regression coefficient in the baseline-tax areas was significantly higher than the value in the high-tax areas (F = 12.712, p < 0.001). Similarly, the impact of water pollution on residents' happiness was statistically significant (coefficient -0.264, 95% CI -0.353, -0.174, p < 0.001) in the baseline-tax areas and in the high-tax areas (coefficient -0.063, 95% CI -0.091, -0.035, p < 0.001), but the Chow Test showed that the absolute value of the regression coefficient in the baseline-tax areas was significantly higher than the value in the high-tax areas (F = 13.758, p < 0.001). Conclusions: Both air and water pollution impair residents' happiness. The present study shows for the first time that enacting an environmental tax significantly alleviates the negative effect of air and water pollution on residents' happiness. The findings of the present study provide empirical evidence for the government to levy environmental tax.