Articles | Volume 22, issue 17
Atmos. Chem. Phys., 22, 11239–11253, 2022
https://doi.org/10.5194/acp-22-11239-2022
Atmos. Chem. Phys., 22, 11239–11253, 2022
https://doi.org/10.5194/acp-22-11239-2022
Research article
02 Sep 2022
Research article | 02 Sep 2022

Chemical evolution of secondary organic aerosol tracers during high-PM2.5 episodes at a suburban site in Hong Kong over 4 months of continuous measurement

Qiongqiong Wang et al.

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Short summary
Secondary organic aerosol (SOA) is often enhanced during fine-particulate-matter (PM2.5) episodes. We examined bi-hourly measurements of SOA molecular tracers in suburban Hong Kong during 11 city-wide PM2.5 episodes. The tracers showed regional characteristics for both anthropogenic and biogenic SOA as well as biomass-burning-derived SOA. Multiple tracers of the same precursor revealed the dominance of low-NOx formation pathways for isoprene SOA and less-aged monoterpene SOA during winter.
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