成都市臭氧重污染成因与来源解析

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Abstract Based on the method of source analysis, a relatively serious ozone pollution event in Chengdu in 2020 was studied. The results shown that, the pollution event showed a trend of clean-pollution-clean, and the pollution event lasted for 9 days, with the maximum hourly ozone concentration reaching 258.8μg/m³. Meteorological conditions played a vital role in the formation of O₃ in Chengdu. Among them, temperature and O₃ concentration shown a significant positive correlation. The northeast wind mainly appeared before and after the pollution event, which might dilute and diffuse the concentration of ozone; the southeast wind mainly appeared during the pollution event and had a transmission effect on O₃. Alkenes and aromatics played a leading role in the O₃ formation in Chengdu which were important precursors for ozone pollution control. Gasoline vehicle emissions(+combustion sources) were the primary source of volatile organic compounds(VOCs) in Chengdu(27.3%~58.7%), and had a significant increase during the pollution event. Chengdu should focus on effective control measures for gasoline vehicle emissions(+ combustion sources) in the treatment of ozone pollution. In the heavy ozone pollution events, accurate identification of the cause of O₃ pollution is a prerequisite for pollution control. Based on the comprehensive analysis of meteorological factors and ozone sources in Chengdu, two pollution scenarios were found:scenario of synergy between local production and transport, and scenario of regional transport.Therefore, under the pollution scenario of synergy between local production and transport, it is necessary to take measures to control the emission of precursors, pay close attention to the transmission of ozone, and strengthen joint prevention and control. Under the pollution scenario of regional transport, the control measures should be focused on regional joint prevention and control.

Key words： ozone pollution local production regional transport volatile organic compounds(VOCs) source apportionments Chengdu

Received: 03 August 2021

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	Articles by authors
	SONG Meng-di
	FENG Miao
	LI Xin
	TAN Qin-wen
	SONG Dan-lin
	LIU He-fan
	DONG Hua-bin
	CENG Li-min
	LU Ke-ding
	ZHANG Yuan-hang

Cite this article:

SONG Meng-di,FENG Miao,LI Xin等. Causes and sources of heavy ozone pollution in Chengdu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1057-1065.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1057

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