汾渭平原城市大气污染演变及典型污染过程——以宝鸡市为例

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Abstract The evolution of urban air pollution and typical pollution characteristics during the past five years (2017~2021) in the western Fenwei Plain (Baoji City) were investigated. The air quality has been improved significantly from 2017 to 2021 in Baoji City. The concentrations of PM_2.5, CO-95 per (the 95^th percentile of the daily concentrations of CO) and SO₂ decreased by 24%, 47% and 36%, respectively, which indicated that the control of coal combustion was effective in Baoji City. The inter-annual variations of O₃-8h-90 per (the 90^th percentile of the daily concentrations of O₃-8h) were comparable. The pollution of O₃ should be given more consideration. The correlations between PM_2.5 and O_x showed higher significance in summer than that in winter. High O₃ concentrations can contribute to the enhancement of atmospheric oxidation and thus promote the formation of secondary aerosol in summer. The serious PM_2.5 pollution were attributed to the low temperature, high humidity and low wind speed in winter, while those for O₃ pollution were high temperature and low humidity in summer. Two typical pollution events were discussed with PM_2.5 (pollution 1) and PM₁₀ (pollution 2) as primary pollutant, respectively. The concentrations of EC (element carbon) and SNA (SO₄^2-, NO₃^- and NH₄⁺) increased significantly in pollution 1, which was attributed to the enhanced local emissions and secondary components. Due to the transport of dust, the concentrations of Al, Si, Ca, Fe and other crustal elements increased significantly in pollution 2. The largest contributors to PM_2.5 were SNA (52%) and dust (65%) in the two pollution processes, respectively.

Key words： Fenwei Plain PM_2.5 evolution of air pollution pollution process

Received: 05 January 2023

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X513

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	Articles by authors
	SHI Ying-qiang
	QU Yao
	SHI Ju-lian
	LIU Sui-xin
	WANG Lu-yao
	WANG Nan
	ZHOU Yue
	ZHANG Ting
	SU Hui
	ZHU Chong-shu
	CAO Jun-ji

Cite this article:

SHI Ying-qiang,QU Yao,SHI Ju-lian等. Evolution of urban air pollution and typical pollution processes in the Fenwei Plain-Taking Baoji City as an example[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 1-9.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/IS1/1

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