Understanding secondary particles in a regional site of Yangtze River Delta: Insights from mass spectrometric measurement

Submicron particulate matter (PM1) poses significant risks to health risks and global climate. In this study, secondary organic aerosols (SOA) and inorganic compositions were examined for their physicochemical characteristics and evolution using high-resolution aerosol instruments in Changzhou over...

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Bibliographic Details
Published in:The Science of the total environment 2024-07, Vol.933, p.172994-172994, Article 172994
Main Authors: Zhu, Wenfei, Shi, Jialin, Wang, Hui, Yu, Ying, Tan, Rui, Shen, Ruizhe, Chen, Jun, Lou, Shengrong, Hu, Min, Guo, Song
Format: Article
Language:English
Subjects:
ACSM
Changzhou
Chemical composition
Nitrate
Secondary organic aerosol
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Summary:Submicron particulate matter (PM1) poses significant risks to health risks and global climate. In this study, secondary organic aerosols (SOA) and inorganic compositions were examined for their physicochemical characteristics and evolution using high-resolution aerosol instruments in Changzhou over one-month period. The results showed that transport accompanied by regional static conditions leaded to the occurrence of heavy pollution. In addition, regional generation and local emissions also leaded to the occurrence of light and moderate pollution during the observation period in Changzhou. Organic aerosols (OA) and nitrate (NO3−) accounted for 45 % and 23 % of PM1, respectively. The increase in PM1 was dominated by the contribution of NO3− and OA. SOA was dominance in OA (63 % with 40 % MO-OOA), which was higher than primary organic aerosols (POA). Besides, photochemical reactions and the high oxidizing nature of the urban atmosphere promoted the production of OA, especially MO-OOA in Changzhou. Our results highlight that secondary particles contribute significantly to PM pollution in Changzhou, underlining the importance of controlling emissions of gaseous precursors, especially under high oxidation conditions. [Display omitted] •The investigation focused on the chemical characteristics during the autumn-winter period in Changzhou.•Nitrate and OA dominated PM1 concentration in Changzhou.•Photochemical reaction exerted a significant influence on SOA and nitrate formation in Changzhou.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2024.172994