Journal
ENVIRONMENT INTERNATIONAL
Volume 134, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envint.2019.105323
Keywords
Hemispheric CMAQ model; Long-range transport; Health impact; Source apportionment; Background concentration
Categories
Funding
- National Key R & D program of China [2018YFC0213805, 2018YFC0213206, 2017YFC0210006]
- National Natural Science Foundation of China [21625701, 41907190, 51861135102]
- National Research Program for Key Issue in Air Pollution Control [DQGG0107, DQGG0303]
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Long-range transport of air pollutants may cause significant health impacts in the receptor regions. In this study, we calculated the transboundary health impact from different foreign regions using a state-of-the-art air quality model at hemispheric scale. Our results reveal that transboundary PM2.5 pollution from outside China was of great significance, causing 100 thousand (95% CI, 45 thousand-200 thousand) premature deaths in China in 2015, which accounted for 9.60% PM2.5 related premature death in China. The impact of transboundary pollution in China was most significant in winter, in which the average PM2.5 concentration increased by 3.7 mu g/m(3), and was least significant in summer, with the average PM2.5 concentration increasing by 0.5 mu g/m(3). Liaoning and Yunnan provinces were extremely susceptible to transboundary pollution, whose annual average PM2.5 concentrations were increased by 10.2 and 11.4 mu g/m(3) respectively. Among all foreign regions, the impact from South Asia was most significant, causing 30 thousand (95% CI, 12 thousand-62 thousand) premature deaths annually in China. This study only reveals the transboundary impact under the integrated exposure-response (IER) model and fixed meteorology field in 2015. Further studies are needed to investigate how different exposure-response functions and meteorology affect the transboundary PM2.5 pollution and its related death.
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