武汉军运会前后臭氧及其前体物的特征和来源

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Abstract The hourly data of ozone, NO_x (= NO + NO₂) and VOCs (102species) during October~November 2019 provided by Hubei Superstationwere used to analyze the variation characteristics of ozone pollutionduring the Wuhan Military Games (WMG). The photochemical regime of ozone was simulated based on DSMACC box model. The source apportionment of VOCs was conducted by PMF model, and the ozone formation potential of different VOCs sourcewas estimated. The results showed that the maximum daily 8-hour average ozone concentration (maximum MDA8:219.51μg/m³) exceeded the national level II standard before the military games. The MDA8 values (135.11μg/m³ on average) decreased significantly during the military games, and the concentrations (140.98μg/m³) rise after the WMG. The difference of ozone before and during the military games was mainly affected by meteorological conditions, and the increase of ozone after the WMG was mainly due to the significant increase of precursor emissions. The EKMA curve indicates that the photochemical formation of ozone was controlled by a VOC-limited regime during the study period. The VOCssources that contribute greatly to ozone formation before the military games were combustion, petrochemical industry and motor vehicles, accounting for 23.0%, 22.8% and 22.5%, respectively. The main sources of VOCs during the military games were motor vehicles (38.4%) and combustion (25.5%). While petrochemical industry (32.6%) and fuel volatilization (25.7%)were the main sources after the WMG. The results showed that the prevention strategies of the military games had a significant effect on the emission reduction of petrochemical industry, but the emission mitigation of motor vehicles and combustion was not significant. Wuhan should pay more attention to the control of combustion, fuel volatilization and motor vehicle emissions.

Key words： ozone pollution Wuhan Military Games VOCs source apportionment EKMA curve

Received: 01 December 2021

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	MA Jing
	YAN Ying-ying
	KONG Shao-fei
	SONG Ai-li
	CHEN Nan
	ZHU Bo
	QUAN Ji-hong
	QI Shi-hua

Cite this article:

MA Jing,YAN Ying-ying,KONG Shao-fei等. Characteristics and sources of ozone and its precursors aroundthe Wuhan Military Games[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3023-3032.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3023

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