杭州市大气VOCs组成特征及二次污染生成贡献

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Abstract Based on the observation data of atmospheric volatile organic compounds (VOCs) in urban areas of Hangzhou from January to December 2021, the chemical composition and the pollution characteristics of VOCs were analyzed, using the positive matrix factorization method (PMF) to do a source analysis survey, the ozone formation potential (OFP) and secondary organic aerosol formation potential (AFP) of VOCs were estimated by using the maximum incremental reactivity (MIR) and aerosol formation coefficient (FAC), their secondary pollution generation contribution was quantitatively evaluated. The results showed that the average volume fraction of atmospheric VOCs in Hangzhou during the observation period was 30.65×10^-9, alkanes and halogenated hydrocarbons were the main components, accounting for 49.23% and 24.47% respectively, the top 10VOCs species were mainly C2~C4alkanes, C7~C8aromatic hydrocarbons and ethylene, of which propane, ethane and dichloromethane accounted for 34% of the total top 10species. The source analysis results show that the main sources of VOCs in Hangzhou are combustion source, solvent use source, industrial emission source, oil and gas emission source and motor vehicle exhaust emission sources. The total OFP of VOCs in Hangzhou was 50.56×10^-9, of which ethylene, 1-ethyl-3-methylbenzene and toluene were the main contributing components of OFP. The contribution of aromatic hydrocarbons to the formation potential of secondary organic aerosols was 91.52%, indicating that aromatic hydrocarbons are the most important SOA precursors, so controlling the emission from motor vehicle exhaust and VOCs generated during solvent use can effectively reduce the generation of SOA.

Key words： Hangzhou volatile organic compounds (VOCs) ozone formation potential (OFP) secondary organic aerosol formation potential (AFP)

Received: 02 September 2023

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X511

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	QIAN Si-yao
	GUAN Jing-wen
	GUAN Lu
	ZHANG Tian
	WANG Yun-yun
	SHEN Jian-dong
	YU Xing-na

Cite this article:

QIAN Si-yao,GUAN Jing-wen,GUAN Lu等. Composition characteristics of volatile organic compounds and contribution to secondary pollution formation in Hangzhou[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(4): 1921-1928.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I4/1921

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