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Sci Total Environ

Title:		Source characterization of volatile organic compounds in urban Beijing and its links to secondary organic aerosol formation
Author(s):		Liu Q; Sheng J; Wu Y; Ma Z; Sun J; Tian P; Zhao D; Li X; Hu K; Li S; Shen X; Zhang Y; He H; Huang M; Ding D; Liu D;
Address:		"State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China. Beijing Weather Modification Center, Beijing 100089, China. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, China. Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China. Beijing Weather Modification Center, Beijing 100089, China; Field Experiment Base of Cloud and Precipitation Research in North China, China Meteorological Administration, Beijing 101200, China. Beijing Weather Modification Center, Beijing 100089, China; Beijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing 100089, China. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, China. Electronic address: dantongliu@zju.edu.cn"
Journal Title:		Sci Total Environ
Year:		2023
Volume:		20221202
Issue:
Page Number:		160469 -
DOI:		10.1016/j.scitotenv.2022.160469
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Volatile organic compounds (VOCs) are precursors for ozone and secondary organic aerosol (SOA) formation, thereby playing a vital role in atmospheric chemistry and urban air quality. To characterize the relationship between VOCs and SOA, organics both in gas and particulate phases were concurrently measured in urban Beijing. The VOCs and organic aerosol (OA) were apportioned into factors with different oxidation levels by applying the factorization analysis on their detailed mass spectra. Six factors of VOCs were identified, including four primary VOCs (PVOC) factors and two secondary VOCs (SVOC) factors. The PVOC factors dominated the total VOCs when the air mass originated in the cleaner northern areas, while SVOC factors dominated for polluted southern air masses. The normalized concentrations of PVOC and primary OA factors showed consistent diurnal variations regardless of air mass directions, owing to the relatively stable local emissions during the experimental period. This contrasted with the secondary factors due to more complex transformation processes. The traffic-related VOCs and solid fuel combustion VOCs negatively correlated with SOA, implying that they may have contributed to the SOA formation through photooxidation. The VOCs in lower oxidation levels were found to have poor correlations with the less oxidized SOA, whereas they correlated strongly to the more oxidized SOA. This implied that the less oxidized SOA may be in a transition state, where its production and loss rates were balanced. These served as products of VOCs oxidation and reactants of more oxidized SOA formation, playing important roles on the VOC to SOA transformation. The identified VOC emission sources and their photochemical production of SOA should be considered in air quality policy planning"
Keywords:		*Volatile Organic Compounds/analysis *Air Pollutants/analysis Beijing *Ozone/analysis Aerosols/analysis China Environmental Monitoring Air mass trajectories PTR-ToF-MS SOA formation Source apportionment VOCs;
Notes:		"MedlineLiu, Quan Sheng, Jiujiang Wu, Yangzhou Ma, Zhiqiang Sun, Junying Tian, Ping Zhao, Delong Li, Xia Hu, Kang Li, Siyuan Shen, Xiaojing Zhang, Yangmei He, Hui Huang, Mengyu Ding, Deping Liu, Dantong eng Netherlands 2022/12/05 Sci Total Environ. 2023 Feb 20; 860:160469. doi: 10.1016/j.scitotenv.2022.160469. Epub 2022 Dec 2"