Articles | Volume 25, issue 17
https://doi.org/10.5194/acp-25-9831-2025
https://doi.org/10.5194/acp-25-9831-2025
Research article
 | 
04 Sep 2025
Research article |  | 04 Sep 2025

Fossil-dominated secondary organic aerosol (SOA) formation in coastal China: size-divergent pathways of aqueous Fenton reactions versus gas-phase volatile organic compound (VOC) autoxidation

Jia-Yuan Wang, Meng-Xue Tang, Shan Lu, Ke-Jin Tang, Xing Peng, Ling-Yan He, and Xiao-Feng Huang

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Cited articles

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Our study explores how secondary organic aerosols (SOAs), a major component of air pollution, form across different particle sizes in a coastal city in China. We found that SOA in fine particles is mainly produced through aqueous chemical reactions, especially those involving iron. In contrast, coarse particles form SOA through reactions with ozone and gases from both fossil fuels and natural sources. These findings highlight the need for size-specific air pollution models.
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