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Environ Pollut

Title:		Ozone and SOA formation potential based on photochemical loss of VOCs during the Beijing summer
Author(s):		Zhan J; Feng Z; Liu P; He X; He Z; Chen T; Wang Y; He H; Mu Y; Liu Y;
Address:		"Aerosol and Haze Laboratory, Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China. Beijing Institute of Petrochemical Technology, Beijing 102617, China. Aerosol and Haze Laboratory, Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China. Electronic address: liuyc@buct.edu.cn"
Journal Title:		Environ Pollut
Year:		2021
Volume:		20210531
Issue:
Page Number:		117444 -
DOI:		10.1016/j.envpol.2021.117444
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"Volatile organic compounds (VOCs) are easily degraded by oxidants during atmospheric transport. Therefore, the contribution of VOCs to ozone (O(3)) and secondary organic aerosol (SOA) formation at a receptor site is different from that in a source area. In this study, hourly concentrations of VOCs and other pollutants, such as O(3), NOx, HONO, CO, and PM(2.5), were measured in the suburbs (Daxing district) of Beijing in August 2019. The photochemical initial concentrations (PICs), in which the photochemical losses of VOCs were accounted for, were calculated to evaluate the contribution of the VOCs to O(3) and SOA formation. The mean (+/-standard deviation) measured VOC concentrations and the PICs were 11.2 +/- 5.7 and 14.6 +/- 8.4 ppbv, respectively, which correspond to O(3) formation potentials (OFP) of 57.8 +/- 26.3 and 103.9 +/- 109.4 ppbv and SOA formation potentials (SOAP) of 8.4 +/- 4.1 and 10.3 +/- 7.4 mug m(-3), respectively. Alkenes contributed 80.5% of the consumed VOCs, followed by aromatics (13.3%) and alkanes (6.2%). The contributions of the alkenes and aromatics to the OFP(PICs) were 56.8% and 30.3%, respectively; while their corresponding contributions to the SOAP(PICs) were 1.9% and 97.3%, respectively. The OFP(PICs) was linearly correlated with the observed O(3) concentrations (OFP(PICs) = 41.5 + 1.40 x c(O3), R(2) = 0.87). The O(3) formation was associated with a VOC-limited regime at the receptor site based on the measured VOCs and changed to a transition regime and a NOx sensitive regime based on the PIC. Our results suggest that more attention should be paid to biogenic VOCs when studying O(3) formation in summer in Beijing, while the control of anthropogenic aromatic compounds should be given priority in terms of SOA formation"
Keywords:		Aerosols/analysis *Air Pollutants/analysis Beijing China Environmental Monitoring *Ozone/analysis *Volatile Organic Compounds/analysis O(3) pollution Organic aerosol pollution Photochemical initial concentrations Photochemical loss Volatile organic compou;
Notes:		"MedlineZhan, Junlei Feng, Zeming Liu, Pengfei He, Xiaowei He, Zhouming Chen, Tianzeng Wang, Yafei He, Hong Mu, Yujing Liu, Yongchun eng England 2021/06/06 Environ Pollut. 2021 Sep 15; 285:117444. doi: 10.1016/j.envpol.2021.117444. Epub 2021 May 31"