Abstract
Only a few recent systematic reviews and meta-analysis studies have quantitatively assessed the effect of short-term exposure to ambient fine particular matter with an aerodynamic diameter of less than 2.5 μm (PM2.5) on respiratory disease (RD) mortality and RD hospital outpatient visits in the Chinese population. A total of 46 articles were selected from Web of Science, PubMed, China National Knowledge Infrastructure and Wanfang databases. Generic inverse variance method was employed to pool individual effect estimates. Pooled estimates represented the increased risk of daily RD mortality and RD outpatient visits per 10 µg/m3 increase in PM2.5 concentrations. Positive associations were identified between short-term PM2.5 exposure and RD in China. The risk of RD mortality and RD outpatient visits increased by 0.48% (95% CI 0.40%, 0.55%) and 0.90% (95% CI 0.62%, 1.18%), respectively, per 10 µg/m3 increase in PM2.5 concentrations. A low increased risk of RD outpatient visits (0.62%, 95% CI 0.57%, 0.66%) was identified at a high level of annual mean PM2.5 concentrations (41.36–110.80 µg/m3) with 1.82% (95% CI 1.72%, 1.92%) at a low level of annual mean PM2.5 concentrations (29.86–40.20 µg/m3) through subgroup analysis. Short-term exposure to PM2.5 was associated with increased risks of RD mortality and RD outpatient visits. The increased risk of RD outpatient visits was pronounced at a low level of annual mean PM2.5 concentrations, but the exact mechanisms of this phenomenon require further investigation. Evidence demonstrated in this study could appeal to Chinese policymakers to improve air quality and alleviate the adverse health impact of PM2.5 pollutions.
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Abbreviations
- WHO:
-
World Health Organization
- AQG:
-
Air quality guideline
- RD:
-
Respiratory disease
- PM2.5 :
-
Fine particular matter with aerodynamic diameter less than 2.5 μm
- TSP:
-
Total suspended particulate
- PM10 :
-
Inhalable particulate matter with diameter less than 10 μm
- PM2.5–10 :
-
Coarse particulate matter with aerodynamic diameter between 2.5 and 10 μm
- SO2 :
-
Sulfur dioxide
- NOx :
-
Nitrogen oxides
- RR:
-
Relative risk
- OR:
-
Odds ratio
- ER:
-
Excess risk
- CI:
-
Confidence interval
- LCI:
-
Lower confidence interval
- UCI:
-
Upper confidence interval
- DOW:
-
Day of week
- ICD:
-
International classification of diseases
- CNKI:
-
China national knowledge infrastructure
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Acknowledgements
The authors would like to express gratitude to Junyan Ye for helping to make the map. We also thank Yingjie Fu, Huicui Shan and Linlin Yin for providing necessary materials and helpful comments on the article.
Funding
This research was funded by the Social Science Planning and Research Project of Shandong Province (19CZKJ02) and the Health Industry Research Project on Medical and Health Care of Shandong University (19SDUY01). Nan Zhang was partly supported by Cathie Marsh Institute for Social Research seedcorn funding about the impact of air pollution on wellbeing of older people in the Global South, and Global Challenge Research Fund (GCRF) Pump-Priming Grant.
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JS and JW conceived and designed the research. JS, XY and MW retrieved and screened literatures and extracted data. JS conducted quantitative meta-analysis and finished the first version of the manuscript. NZ and JW provided project supervision and guidance to the writing of the article. They also reviewed, edited and modified the manuscript critically for some important content.
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Sun, J., Zhang, N., Yan, X. et al. The effect of ambient fine particulate matter (PM2.5) on respiratory diseases in China: a systematic review and meta-analysis. Stoch Environ Res Risk Assess 34, 593–610 (2020). https://doi.org/10.1007/s00477-020-01786-0
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DOI: https://doi.org/10.1007/s00477-020-01786-0