Real?Time Characterization of Aerosol Compositions, Sources, and Aging Processes in Guangzhou During PRIDE?GBA 2018 Campaign

To investigate the chemical compositions, sources, and aging processes of submicron particles (PM1), a comprehensive field campaign was conducted in Guangzhou urban area China during autumn (October–November) 2018. The average mass concentration PM1 35.6 ± 20.8 µg m?3, which mainly contributed by organic aerosols (OA, 42%), then followed sulfate (25%) inorganic nitrate (11%). found to be main driving component (up ?50%) account for fast increase polluted periods autumn. promotion effects sulfate, aerosol liquid water content, acidity on formation were systematically discussed. Source apportionment results showed 72% OA secondary (SOA), 28% primary (POA), including vehicle emission related hydrocarbon-like (HOA, 16%), nitrogen-containing (NOA, 3%) cooking (COA, 8%). explore OA, dynamic variations its oxidation level as function ambient photochemical age are shown. Using an situ field-deployed flow reactor, heterogeneous reaction rate coefficients POA with OH radicals () estimated 4.0–5.4 × 10?13 cm3 molecules?1 s?1, is equivalent lifetime >2 weeks. long supports gas phase major pathway aging. uptake coefficient 0.76–0.84, underlining that can taken up efficiently aerosols.