Zeng, Siqi Zhou, Wei Li, Yan Zhang, Zijun Zhang, Yu Wang, Yuying Kim, Kyung Hwan Ji, Dongsheng Hu, Bo Kim, Jin Young Wang, Zifa Sun, Yele 2025-01-07T06:00:34Z 2025-01-07T06:00:34Z 2024-12-30 2024-12 2515-7620 https://pubs.kist.re.kr/handle/201004/151500 Aerosol chemistry in China has undergone significant transformation due to stringent emission control measures, leading to great shifts in aerosol composition and formation mechanisms. This study investigates the summer chemical evolution of aerosol species in Beijing over the past decade based on two summertime measurements using aerosol chemical speciation monitors. The results reveal a substantial decrease in fine particulate matter concentrations by 72.7% in summer over the past decade, particularly primary species that dropped by 86.3%-95.1%. However, this improvement in particulate matter was accompanied by a worsening of ozone pollution between 2011 and 2022. In contrast, secondary components such as sulfate and secondary organic aerosol (SOA) exhibited significant increases in their contributions, rising from 18.2%-25.5% to 21.4%-41%. The varying responses of aerosol species to emission reductions are closely tie to changes in emission sources, aerosol chemistry, and meteorology. By decoupling the influence of meteorology through machine learning, our analysis highlights the crucial role of emission reductions in improving air quality, though with different impacts on aerosol chemistry. The dominant formation mechanisms of secondary components varied between the two summers, likely influenced by shifts in aerosol liquid water content and atmospheric oxidation capacity due to NOx reductions. Compared to the summer of 2011, the formation of sulfate and SOA in summer 2022 was primarily driven by photochemical processes related to ozone, with less impacts from aqueous-phase formation, while nitrate was predominantly formed via N2O5 heterogeneous hydrolysis. Considering the complex nature of secondary aerosol formation, future summer pollution control strategies should prioritize stricter collaborative regulation of precursors for both secondary aerosol and ozone. English IOP Publishing Decadal changes in summer aerosol composition and secondary aerosol formation mechanisms in Beijing Article 10.1088/2515-7620/ad9711 1 Environmental Research Communications, v.6, no.12 Environmental Research Communications 6 12 Y scie scopus 001370975000001 2-s2.0-85211062865 Environmental Sciences Environmental Sciences & Ecology Article CHEMICAL SPECIATION MONITOR EMISSION CONTROLS AIR-QUALITY PARTICULATE NITRATE SIZE DISTRIBUTIONS SUBMICRON AEROSOLS OZONE POLLUTION PM2.5 POLLUTION TOF-ACSM CHINA aerosol chemistry emission control ozone meteorological conditions formation mechanisms secondary organic aerosol