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Sci Total Environ

Title:		"VOC characteristics, sources and contributions to SOA formation during haze events in Wuhan, Central China"
Author(s):		Hui L; Liu X; Tan Q; Feng M; An J; Qu Y; Zhang Y; Cheng N;
Address:		"State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. Electronic address: liuxingang@bnu.edu.cn. Chengdu Academy of Environmental Sciences, Chengdu 610072, China. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Beijing Municipal Environmental Monitoring Center, Beijing 100048, China"
Journal Title:		Sci Total Environ
Year:		2019
Volume:		20181003
Issue:		Pt 2
Page Number:		2624 - 2639
DOI:		10.1016/j.scitotenv.2018.10.029
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Based on detailed data on 102 volatile organic compounds (VOCs) measured continuously from 2016.10.9 to 2016.11.17 in Wuhan, the VOC characteristics, secondary organic aerosol (SOA) characteristics, SOA formation potential (SOAP), potential source regions, sources and contributions during different haze episodes were analyzed. The total VOC (TVOC) concentrations on clear days (visibility >10?ª+km), slight haze days (visibility of 5-10?ª+km), and severe haze days (visibility <5?ª+km) were 34.87?ª++/-?ª+14.89?ª+ppbv, 45.06?ª++/-?ª+26.69?ª+ppbv, and 49.55?ª++/-?ª+24.82?ª+ppbv, respectively. The SOAP on haze days (447.04?ª++/-?ª+253.85?ª+ppbv) was significantly higher than that on clear days (300.62?ª++/-?ª+138.48?ª+ppbv), and aromatics were the dominant contributors to SOA formation under different visibility conditions, accounting for approximately 97% of the total SOAP. The ratio of ethylbenzene to m/p-xylene (E/X) indicated that atmospheric photochemical reactions were slightly stronger on haze days. The ratio of toluene to benzene (T/B) indicated that vehicle exhaust had significant effects on VOCs, but no significant changes occurred during different haze episodes. The ratio of benzene, toluene, ethylbenzene and xylenes (BTEX) to CO indicated that VOCs from solvent usage in painting/coating and industrial emissions increased with increasing haze pollution. Based on backward trajectories and the potential source contribution function (PSCF), short-distance transport was the main source influencing VOC pollution, especially transport from the southwest. Seven sources were identified by positive matrix factorization (PMF): industrial sources, vehicular exhaust, solvent usage in painting/coating, fuel evaporation, liquefied petroleum gas (LPG) usage, biogenic sources and biomass burning. Moreover, solvent usage in painting/coating, vehicle exhaust and LPG usage were the most important sources that significantly aggravated VOC pollution during haze events. The results can provide references for local governments developing control strategies of VOCs during haze pollution events"
Keywords:		Haze Pscf SOA formation potential Source apportionment VOCs;
Notes:		"PubMed-not-MEDLINEHui, Lirong Liu, Xingang Tan, Qinwen Feng, Miao An, Junling Qu, Yu Zhang, Yuanhang Cheng, Nianliang eng Netherlands 2018/10/31 Sci Total Environ. 2019 Feb 10; 650(Pt 2):2624-2639. doi: 10.1016/j.scitotenv.2018.10.029. Epub 2018 Oct 3"