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Environ Pollut

Title:		"Significant decreases in the volatile organic compound concentration, atmospheric oxidation capacity and photochemical reactivity during the National Day holiday over a suburban site in the North China Plain"
Author(s):		Yang Y; Wang Y; Yao D; Zhao S; Yang S; Ji D; Sun J; Wang Y; Liu Z; Hu B; Zhang R; Wang Y;
Address:		"Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of the Chinese Academy of Sciences, Beijing, 100049, China. Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, P.O.Box 64, 00014, University of Helsinki, Helsinki, Finland. Electronic address: yonghong.wang@helsinki.fi. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of the Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing, 10029, China. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of the Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China. Electronic address: wys@mail.iap.ac.cn"
Journal Title:		Environ Pollut
Year:		2020
Volume:		20200425
Issue:		Pt A
Page Number:		114657 -
DOI:		10.1016/j.envpol.2020.114657
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"To what extent anthropogenic emissions could influence volatile organic compound (VOCs) concentrations and related atmospheric reactivity is still poorly understood. China's 70th National Day holidays, during which anthropogenic emissions were significantly reduced to ensure good air quality on Anniversary Day, provides a unique opportunity to investigate these processes. Atmospheric oxidation capacity (AOC), OH reactivity, secondary transformation, O(3) formation and VOCs-PM(2.5) sensitivity are evaluated based on parameterization methods and simultaneous measurements of VOCs, O(3), NO(x), CO, SO(2), PM(2.5), JO(1)D, JNO(2), JNO(3) carried out at a suburban site between Beijing and Tianjin before, during, and after the National Day holiday 2019. During the National Day holidays, the AOC, OH reactivity, O(3) formation potential (OFP) and secondary organic aerosol formation potential (SOAP) were 1.6 x 10(7) molecules cm(-3) s(-1), 41.8 s(-1), 299.2 mug cm(-3) and 1471.8 mug cm(-3), respectively, which were 42%, 29%, 47% and 42% lower than pre-National Day values and -12%, 42%, 36% and 42% lower than post-National Day values, respectively. Reactions involving OH radicals dominated the AOC during the day, but OH radicals and O(3) reactions at night. Alkanes (the degree of unsaturation = 0, (D, Equation (1)) accounted for the largest contributions to the total VOCs concentration, oxygenated VOCs (OVOCs; D
Keywords:		*Air Pollutants/analysis Beijing China Environmental Monitoring Holidays *Ozone/analysis *Volatile Organic Compounds/analysis Atmospheric oxidation capacity National day OH reactivity Secondary transformation VOCs-sensitivity coefficient;
Notes:		"MedlineYang, Yuan Wang, Yonghong Yao, Dan Zhao, Shuman Yang, Shuanghong Ji, Dongsheng Sun, Jie Wang, Yinghong Liu, Zirui Hu, Bo Zhang, Renjian Wang, Yuesi eng England 2021/02/24 Environ Pollut. 2020 Aug; 263(Pt A):114657. doi: 10.1016/j.envpol.2020.114657. Epub 2020 Apr 25"