唐山一次冬季重污染过程污染特征及成因分析

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Abstract

Characteristics and formation mechanism of a heavy air pollution event during the period from December 27^th to 31^st, 2017 in Tangshan, Hebei, China were investigated. Combined with the mass concentration of particulate matter, gaseous pollutant concentrations, carbonaceous species and meteorological data, the component analysis of PM_2.5 was conducted in detail for this episode. The results showed that the average mass concentration of PM_2.5 during this period was 154μg/m³ exceeding the secondary standard of daily average concentration of the ambient air quality standard (GB3095-2012). When the air pollution level was 5 and above, passed the level of heavy and above, the ratio of PM_2.5 over PM₁₀ became 0.7. The mass concentration of SNA accounted for 58.0% of PM_2.5, and the value of OC/EC was 4.1, which indicated that the secondary reaction of particulate matter and organic matter had a greater contribution in this pollution process. The local meteorological conditions, continuous uniform pressure field, the near-surface high humidity, light breeze and temperature inversion all played an important role in this heavy pollution event. Regional transmission was also an important contribsuting factor to this heavy pollution process.

Key words： heavy pollution PM_2.5 Tangshan pollution characteristics water-soluble inorganic ions

Received: 25 September 2018

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X513

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	Articles by authors
	LIANG Xiao-yu
	SHAN Chun-yan
	MENG Yao
	LIU Jing

Cite this article:

LIANG Xiao-yu,SHAN Chun-yan,MENG Yao等. Characteristics and formation mechanism of a heavy winter air pollution event in Tangshan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1804-1812.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I5/1804

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