Nontarget Screening Exhibits a Seasonal Cycle of PM_2.5 Organic Aerosol Composition in Beijing.

ABSTRACT: The molecular composition of atmospheric particulate matter (PM) in the urban environment is complex, and it remains a challenge to identify its sources and formation pathways. Here, we report the seasonal variation of the molecular composition of organic aerosols (OA), based on 172 PM_2.5 filter samples collected in Beijing, China, from February 2018 to March 2019. We applied a hierarchical cluster analysis (HCA) on a large nontarget-screening data set and found a strong seasonal difference in the OA chemical composition. Molecular fingerprints of the major compound clusters exhibit a unique molecular pattern in the Van Krevelen-space. We found that summer OA in Beijing features a higher degree of oxidation and a higher proportion of organosulfates (OSs) in comparison to OA duri

SUBMITTER: Ma J 

PROVIDER: S-EPMC9179655 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature