Chemical composition and sources of PM1 and PM2.5 in Beijing in autumn

The Science of the Total Environment
Yanyun ZhangHaiyan Wang

Abstract

Beijing, the capital of China, suffers from severe atmospheric aerosol pollution; nevertheless, a comprehensive study of the constituents and sources of PM1 is still lacking, and the differences between PM1 and PM2.5 are still unclear. In this study, an intensive observation was conducted to reveal the pollution characteristics of PM1 and PM2.5 in Beijing in autumn. Positive matrix factorization (PMF), backward trajectories and a potential source contribution function (PSCF) model were used to identify the source categories and source areas of PM1 and PM2.5. The results showed that the average concentrations of PM1 and PM2.5 reached 78.20μg/m3 and 95.47μg/m3 during the study period, respectively. PM1 contributed greatly to PM2.5. The PM1/PM2.5 value increased from 73.6% to 90.1% with PM1 concentration growing from <50μg/m3 to >150μg/m3. Higher secondary inorganic aerosol (SIA) proportions (31.3%-70.8%) were found in PM1. The higher fraction of SIA, OC, EC and typical elements in PM1 illustrated that anthropogenic components accumulated more in smaller size particles. Three typical weather patterns causing the heavy pollution in autumn were found as follows: (1) Siberian high and uniform high pressure field, (2) cold front and l...Continue Reading

Citations

Jul 19, 2018·International Journal of Environmental Research and Public Health·Jie XuYuan Jiang
Feb 6, 2019·International Journal of Environmental Research and Public Health·Yajie Liu, Feng Dong
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Nov 12, 2021·Environmental Science and Pollution Research International·Nguyen Hong Phuc, Nguyen Thi Kim Oanh
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