2019~2022年华北平原典型地区不同污染等级和污染持续时间下的O<sub>3</sub>污染规律及来源

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Abstract This study selects Juxian, Rizhao with complex terrain as the research area. Based on O₃ monitoring data from provincial control stations in Juxian from 2019 to 2022, the O₃ pollution days were classified according to different O₃ pollution levels and durations. The pollution characteristics and sources of O₃ were explored using backward trajectory model (HYSPLIT), potential source contribution function (PSCF), and concentration weighted trajectory (CWT) models. Results showed that the number of mild pollution days of O₃ in Juxian decreased from 72 to 38 during the period of 2019 to 2021, while rebounded in 2022. The number of moderate pollution days of O₃ have little change. Slight pollution days of O₃ accounted for a high proportion of mild pollution days, with the contribution of 21.4%~39.5%, indicating a great potential for improvement for mild pollution days. Strengthening the control measures for slight pollution days will be beneficial for converting mild pollution days into excellent days and improving the local air quality excellence rate. The longer the duration of O₃ pollution (e.g.,≥3d), the lower the frequency of pollution occurrence, while the O₃ concentration increased with the extend of pollution duration. Simulation results of the HYSPLIT model revealed that the air mass trajectories of different O₃ pollution levels and durations were mainly distributed in the southeast of Juxian and transmitted over medium and short-distances. Besides, trajectories from the southeast of Juxian contained the highest concentration of O₃-8h-90% (250.0±65.9 μg/m³). The PSCF and CWT results showed that the potential source regions of O₃ were mainly distributed in the southeast of Juxian, with the main potential source region appearing in the Yangtze River Delta region. The results are of great significance for guiding the joint prevention and control of air pollution in Juxian and surrounding areas.

Key words： O₃ pollution level pollution duration backward trajectory potential source areas

Received: 07 December 2023

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X511

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	QIAN Yu-xian
	WANG Gang
	MENG Qing-xiao
	LIU Sai
	WANG Yong-qiang

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QIAN Yu-xian,WANG Gang,MENG Qing-xiao等. Characteristics and sources of O₃ pollution under different pollution levels and durations in typical areas of North China Plain from 2019 to 2022[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3581-3591.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I7/3581

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