临汾市臭氧污染变化特征、气象影响及输送源分析

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Abstract The spatial and temporal variations in ozone pollution and their relationship with meteorological factors, transmission paths, and potential source distribution in Linfen City were investigated in this study using the potential source contribution function (PSCF) coupled with the hourly ozone mass concentration observations and meteorological data from 2014 to 2020. Results indicate that Linfen City has suffered from increasingly severe ozone pollution in recent years. Overall, the annual average mass concentration of O₃_8h_max presented an upward trend, exhibiting a 78.79% increase from 2014 to 2020. Monthly variations featured with an "M"-type double peak, and the seasonal variation peak occurred in summer. Besides, the diurnal variation was significantly affected by the near-surface atmospheric photochemical process, showing a discernible single-peak and single-valley distribution with a peak between 14:00 and 16:00. The O₃ concentration demonstrated a significant linear positive correlation with air temperature and hours of sunshine. When the relative humidity was 40%~60%, the temperature was above 20℃, and the wind speed ranged 2~6m/s, the high-concentration O₃ pollution would be liable to occur. The transmission mainly relied on short-distance airflow during periods of heavy O₃-polluted weather. In this context, in addition to local O₃ generation, high O₃ concentrations were also affected by the large NO_x and VOCs emissions from heavy industries in neighboring cities in Shanxi Province, central Shaanxi Province, and northern Henan Province. Therefore, joint prevention and control measures on the O₃ pollution in Linfen City must be adopted throughout the Fenwei Plain area under the premise of strictly controlling the emissions of local pollution sources.

Key words： O₃ mass concentration meteorological factor PSCF CWT Linfen City pollution characteristics

Received: 18 January 2022

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X511

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	Articles by authors
	SONG Xiao-wei
	HAO Yong-pei
	ZHU Xiao-dong
	WANG Jing-wei
	XUE Pan
	LIU Wei-ting

Cite this article:

SONG Xiao-wei,HAO Yong-pei,ZHU Xiao-dong等. Variations in Ozone pollution and their meteorological influences and transmission sources in Linfen City of China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3626-3634.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3626

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