北京市2018年春季一次沙尘回流过程的污染特征

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Abstract The characteristics of a dust backflow air pollution process in Beijing from Apr. 14^th to 19^th, 2018 were analyzed based on air quality monitoring data, air parcel back trajectory and air pollution characteristic radar chart. According to ρ(PM_2.5), ρ(PM₁₀) and the mass concentration ratio of PM_2.5 to PM₁₀ (PM_2.5/PM₁₀), the entire episode can be divided into four stages:dust stage, intermediate stage, dust backflow stage and post-backflow stage. The highest stage-mean mass concentration of PM₁₀ was observed in the dust stage at (278.5±83.7) μg/m³, and the highest stage-mean mass concentration of PM_2.5 was observed in the post-backflow stage at (135.5±16.9) μg/m³. In addition, the PM_2.5/PM₁₀ was less than 0.2 in the dust stage, and increased to 0.3~0.6 in the dust backflow stage and 0.5~0.8 in the post-backflow stage. The mass fraction of water-soluble inorganic ions (SO₄^2-, NO₃^- and NH₄⁺ in total) in PM_2.5 was 7.3%±2.5% in dust stage, whereas it increased to 47.0%±6.3% in the dust backflow stage and 51.3%±5.7% in the post-backflow stage. This work revealed that particulate and gaseous pollutants from the south part in Beijing-Tianjin-Hebei region were transported to Beijing together with backflow dust, which in part accounted for the PM_2.5 increase in Beijing. Therefore, regional air pollutant emission should be strengthened in dust weather process when dust backflow occurs. Meanwhile, Beijing should reinforce the regulation of vehicle emissions.

Key words： dust backflow pollution characteristics regulation

Received: 09 April 2021

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	ZHANG Mi
	DUAN Jing-chun
	YIN Li-na
	HU Bing-xin
	KANG Pan-ru
	LI Yan-li
	LIU Wen-wen
	ZHOU Xue-ming

Cite this article:

ZHANG Mi,DUAN Jing-chun,YIN Li-na等. Pollution characteristics of a dust backflow process in Beijing in the spring of 2018[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 4990-4998.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/4990

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