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To ensure good air quality for the 2014 Asia-Pacific Economic Cooperation (APEC) summit,stringent emission controls were implemented in Beijing and its surroundingregions, leading to a significant reduction in PM2.5 loadings. Toinvestigate the impact of the emission controls on aerosol chemistry,high-volume PM2.5 samples were collected in Beijing from 8October to 24 November 2014 and determined for secondary inorganicaerosols (SIA, i.e., SO42−, NO3−, and NH4+),dicarboxylic acids, keto-carboxylic acid, and α-dicarbonyls, as wellas stable carbon isotope composition of oxalic acid (C2). Our resultsshowed that SIA, C2, and related secondary organic aerosols in PM2.5 during APEC were2–4 times lower than those before APEC, which is firstly ascribed to thestrict emission control measures and secondly attributed to the relativelycolder and drier conditions during the event that are unfavorable forsecondary aerosol production. C2 in the polluted air masses, which mostly occurred before APEC, areabundant and enriched in 13C. On the contrary, C2 in the cleanair masses, which mostly occurred during APEC, is much less abundant butstill enriched in 13C. In the mixed type of clean and polluted airmasses, which mostly occurred after APEC, C2 is lower than thatbefore APEC but higher than that during APEC and enriched in lighter12C. A comparison on chemical composition of fine particles and δ13C values of C2 in two events that are characterized by highloadings of PM2.5 further showed that after APEC SIA and the totaldetected organic compounds (TDOC) are much less abundant and fine aerosolsare enriched with primary organics and relatively fresh, compared with thosebefore APEC

Concentrations and stable carbon isotope compositions of oxalic acid and related SOA in Beijing before, during, and after the 2014 APEC