太原市采暖季PM<sub>2.5</sub>组分特征及重污染事件分析

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Abstract Based on the on-line observation of PM_2.5 and its water-soluble ions, carbonaceous components and inorganic elements during the heating period of 2017~2018 in Taiyuan City, the composition characteristics under different pollution levels were analyzed combinedwith meteorological data. The analysis indicated that the dominant chemical components of fine particles in the heating period of Taiyuan City from 2017 to 2018 were SO₄^2-, NO₃^-, NH₄⁺, Cl^-, Ca²⁺, OC and EC, which showed the trend of OC > SO₄^2- > NO₃^- > NH₄⁺ > Cl^- > Ca²⁺ > EC. And secondary inorganics increased the most with the pollution level. The correlations between OC and EC under three pollution levels of excellent, light and heavy pollution were 0.69, 0.66 and 0.55, respectively,and N/S were 1.06, 1.29 and 0.93, respectively, indicating that with the increase of pollution levels, the consistency of OC and EC sources gradually deteriorated. In addition,the emission sources were still under the synergetic control of nitrogen emission sources (mobile and industrialsources) and sulfur (coalburning) emission sources, however, the contribution rate of sulfur emission sources increased significantly. The analysis of heavy pollution events showed that in the process of responding to heavy pollution inTaiyuan, it is necessary not only to strengthen the control of emission sources such as vehicles exhaust、industrial sources, etc, but more importantly the control of coal burning.

Key words： Taiyuan PM_2.5 heating season composition characteristics heavy pollution

Received: 31 December 2019

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X513

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	Articles by authors
	NI Deng-feng
	LIU Su
	CAO Li-yuan
	WANG Jie
	GAO Jian
	XIE Jing-fang
	GUO Ying-zhe

Cite this article:

NI Deng-feng,LIU Su,CAO Li-yuan等. Composition characteristics of PM_2.5 and heavy pollution events in Taiyuan City during heating season[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2821-2828.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/2821

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