Chemistry-triggered events of PM2.5 explosive growth during late autumn and winter in Shanghai, China

Environmental Pollution
Wenwen SunJianmin Chen

Abstract

To better understand the mechanism of PM2.5 explosive growth (EG), we conducted concurrent measurements of gaseous pollutants, PM2.5 and its chemical composition (inorganic ions, organic carbon, and element carbon) with a time resolution of 1 h in Shanghai in late autumn and winter from 2014 to 2017. In this study, the EG events, which are defined as the net increase in the mass concentration of PM2.5 by more than 100 μg m-3 within hours, are separately discussed for 3, 6, or 9 h. The number of EG events decreased from 19 cases in 2014 to 6 cases in 2017 and the corresponding PM2.5 concentration on average decreased from 183.6 μg m-3 to 128.8 μg m-3. Both regional transport and stagnant weather (windspeed < 2.0 m s-1) could lead to EG events. The potential source contribution function (PSCF) shows that the major high-pollution region is in East China (including Zhejiang, Jiangsu, Shandong, and Anhui Province) and the North China Plain. The contribution of stagnant conditions to EG episode hours of 55% (198 h, 156.9 μg m-3) is higher than that of regional transport (45%, 230 h, 163.0 μg m-3). To study the impact of local emission, chemical characteristics and driving factors of EG were discussed under stagnant conditions. The ma...Continue Reading

Citations

Feb 5, 2021·Environmental Science & Technology·Jianfei PengRenyi Zhang
Mar 20, 2021·The Science of the Total Environment·Zirui LiuYuanhang Zhang
May 29, 2021·Scientific Reports·Zhaoyu MoShanshan Wang
Aug 25, 2021·Journal of Environmental Management·Huang LingLi Li
Dec 8, 2021·The Science of the Total Environment·Zemin FengXiaolei Bao

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