Field observations reveal iSOA reduction in a megacity, suggesting targeted emissions cuts may mitigate biogenic aerosol impacts.
Key Points
Total isoprene-derived secondary organic aerosol levels decreased in Shanghai's megacity after emissions were reduced, highlighting pathway-specific responses.
Key measurements were performed using gas chromatography-mass spectrometry during summer and winter from 2015 to 2021, showing trends in aerosol formation.
Analysis showed that decreased oxidizing capacity influenced aerosol reactivity, while other factors affected certain tracer levels, complicating emissions responses.
Findings emphasize the importance of tailored anthropogenic emission reductions for controlling biogenic aerosol formation in urban environments.