2019~2021年北京市PM<sub>2.5</sub>及组分受风向影响研究

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Abstract Using the meteorological data, PM_2.5 and component concentration data of Beijing from 2019 to 2021, combined with the NO₂ concentration, the temporal and spatial changes of PM_2.5 and component concentration, meteorological parameters, NO₂ concentration and nitrogen oxidation rate (NOR) were analyzed and compared. The results showed that: (1) PM_2.5 concentration in urban areas of Beijing decreased by 14% in the three years from 2019 to 2021, but NO₃^- rebounded by 12%; (2) Each wind was upward, and the order of PM_2.5 concentration in urban areas of Beijing was: northeast wind> east wind> southwest wind> southeast wind> south wind> west wind> north wind > northwest wind, in addition, the highest concentration of secondary inorganic salt components appeared in the easterly wind direction, and the highest concentration of organic matter (OM) appeared in the southwest wind; (3) In terms of interannual changes in various wind directions, from 2019 to 2021, the concentration of PM_2.5, components and NO₂ in Beijing showed the characteristics of high concentration "eastward shift" in space, and NO₃^- rebounded the highest upward in the northeast wind, reaching 65.7%; (4) The north, northeast and southeast winds were upward, and the relative humidity increases synchronously, and NOR increased synchronously in the northeast and east winds, with an increase of 70%, so it was believed that the rebound of NO₃^- in the northeast wind in Beijing was related to the eastward shift of precursor concentration and the increase of relative humidity in the northeast wind.

Key words： PM_2.5 component concentration wind direction distribution NO₃^- concentration rebound meteorological conditions

Received: 13 April 2023

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X513

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	CHEN Chen
	LI Yun-ting
	CHANG Miao
	JING Kuan
	SUN Feng
	GUO Yuan-xi
	DONG Xin
	SUN Rui-wen
	SHEN Xiu-e
	LIU Bao-xian

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CHEN Chen,LI Yun-ting,CHANG Miao等. The influence of PM_2.5 and component concentration on wind direction in Beijing from 2019 to 2021[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6261-6269.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I12/6261

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