Chemical composition, sources and evolution of PM 2.5 during wintertime in the city cluster of southern Sichuan, China

Atmospheric Pollution Research

article

Junke Zhang¹  Xiaojuan Huang²  Jiaqi Li¹  Luyao Chen¹  Rui Zhao¹  Rui Wang¹  Wei Sun¹  Chunying Chen¹  Yunfei Su¹  Fangzheng Wang¹  Yawen Huang¹  Chaobiao Lin¹ 

[1] Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University;Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention ,(LAP3), Department of Environmental Science & Engineering, Fudan University

关键词: PM 2.5;    Chemical components;    Sources;    Evolution;    Southern Sichuan;   

DOI  :  10.1016/j.apr.2022.101635

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

The city cluster of southern Sichuan is not only the key haze area in the Sichuan Basin, China, but also seriously affects the air quality of surrounding areas. In order to obtain comprehensive information on the characteristics of air pollution in this area, this study conducted synchronous sampling and analysis of fine particulate matter (PM 2.5 ) in four cities (Zigong, Luzhou, Neijiang and Yibin) in this area during the wintertime of 2018–2019. The results showed that the average concentration of PM 2.5 in these four cities was 111–124 μg m −3 , with more than 90% of days being polluted days. The contributions from carbonaceous components, water-soluble inorganic ions (WSIIs) and trace elements to PM 2.5 were 17.3–18.9%, 34.3–38.2% and 2.2–3.0%, respectively. The contributions of secondary inorganic ions (SO 4 2− , NO 3 − and NH 4 + ) to WSIIs were 91.1–93.0%. The changes in the chemical components during the process of pollution aggravation were significantly different from those in most cities in China, with the contribution from organic carbon increasing, while the contribution from WSIIs decreased. PM 2.5 mainly came from dust, combustion, vehicular emissions, industrial processes and secondary inorganic sources. Compared with most megacities or provincial capitals in China, the contributions from dust (18.1–23.6%), combustion (17.9–21.1%) and industrial processes (9.2–12.0%) were at a higher level, and these sources can be regarded as the primary targets for pollution reduction in the future. The formulation of air pollution reduction policies needs to consider local conditions, such as sources, energy structure, management level.

【 授权许可】

CC BY