Characteristics of Volatile Organic Compounds and Their Contribution to Secondary Organic Aerosols during the High O<sub>3</sub> Period in a Central Industry City in China
Dan Yao,
Chenhong Li,
Qiuying Niu,
Wenkang Gao,
Hao Yu,
Guangxuan Yan,
Jingda Liu,
Zhiguo Cao,
Shuai Wang,
Yuesi Wang
Affiliations
Dan Yao
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, School of Environment, Ministry of Education, Henan Normal University, Xinxiang 453007, China
Chenhong Li
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, School of Environment, Ministry of Education, Henan Normal University, Xinxiang 453007, China
Qiuying Niu
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, School of Environment, Ministry of Education, Henan Normal University, Xinxiang 453007, China
Wenkang Gao
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Hao Yu
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, School of Environment, Ministry of Education, Henan Normal University, Xinxiang 453007, China
Guangxuan Yan
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, School of Environment, Ministry of Education, Henan Normal University, Xinxiang 453007, China
Jingda Liu
Wuxi Cas Photonics Co., Ltd., Wuxi 214135, China
Zhiguo Cao
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, School of Environment, Ministry of Education, Henan Normal University, Xinxiang 453007, China
Shuai Wang
China National Environmental Monitoring Center, Beijing 100012, China
Yuesi Wang
Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, School of Environment, Ministry of Education, Henan Normal University, Xinxiang 453007, China
High loads of fine particulate matter (PM2.5) and ozone (O3) pollution occurred frequently since early spring and led to an increasing contribution of secondary organic aerosols (SOA) in organic aerosols. However, the characteristics of precursor volatile organic compounds (VOCs) have rarely been studied. In this study, the continuous observation of VOCs was performed by an offline VOC monitoring system and gas chromatography-mass/flame ionization detector from 1 April 2020 to 31 July 2020; the characterization of VOCs and their contribution to SOA was explored. The results showed that during the observation period, the average mixing ratio of TVOCs was 42.6 ± 11.2 ppbv, and the major VOCs species were OVOCs, followed by alkanes, halocarbons, aromatics, alkenes and acetylene. When the west circulation pattern functioned, the value of aromatics increased, and the relation between PM2.5, O3 and VOCs increased when the high-pressure system controlled by anticyclone functioned. In combination with the results of positive matrix factorization, the main emission sources of ambient VOCs were complex, and the fuel combustion, industry-related emission, vehicle emission, biogenic emission and solvent volatilization accounted for 27.1%, 24.4%, 24.3%, 12.1% and 12.0%, respectively. Moreover, the industry-related emission contributed the greatest to the generation of SOA. This result indicated that the restrictions on aromatics during the industrial process are vital to reducing SOA formation.
