北京冬季一次重污染过程的污染特征及成因分析

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Abstract

In order to study the characteristics and formation mechanism during a heavy air pollution episode in Beijing during 9~15January in 2013, the weather conditions, chemical characteristics of particulate matter and atmospheric environmental background were analyzed. The results showed that the average daily mass concentrations of PM₁₀ and PM_2.5 were 347.7μg/m³and 222.4μg/m³, respectively, exceeding the corresponding ambient air quality standards (GB3095-2012) of China. During the pollution episode, NH₄⁺, NO₃^- and SO₄²^- made a combined contribution of 44.0% to PM_2.5 concentration. The average ratios of OC/EC were 5.44. This indicates a large contribution from secondary ions and organic matters to PM_2.5. The atmosphere was relatively stable during the study period in Beijing because of the stable atmosphere circulation, the adverse near-ground meteorological conditions of high humidity and low wind speed as well as the lower and deeper inversion layer. The stable atmospheric condition and the land structure surrounded by mountains on three sides in Beijing restrained the dispersion of pollutants, and these were the main causes of this heavy pollution process.

Key words： heavy pollution PM_2.5 chemical composition pollution characteristics Beijing

Received: 26 June 2015

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X513

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	Articles by authors
	YANG Xiao-wen
	ZHOU Ying
	CHENG Shui-yuan
	WANG Gang
	WANG Xiao-qi

Cite this article:

YANG Xiao-wen,ZHOU Ying,CHENG Shui-yuan等. Characteristics and formation mechanism of a heavy winter air pollution event in Beijing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(3): 679-686.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I3/679

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