河南省春节和疫情影响情景下PM<sub>2.5</sub>组分特征

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Abstract In January 2020, a new coronavirus epidemic broke out in China, when the emission characteristics of air pollution have changed significantly. To study the characteristics of PM_2.5 components under this scenario, a series of online observation instruments were used in Zhengzhou, Anyang, and Xinxiang cities from January 1 to February 13, 2020. The study period is divided into pre-holiday (January 1 to 23), mid-holiday outbreak (January 24 to 31), and post-holiday outbreak (February 1 to 13) based on the Spring Festival holiday and the outbreak of the epidemic. Affected by the outbreak and favorable meteorological conditions, the concentrations of other pollutants except O₃ in the three cities during the post-holiday outbreak were significantly lower than those during pre-holiday, especially NO₂ decreased by 65%, 52%, and 72% and PM_2.5 decreased by 51%, 55%, and 54%, respectively. Note that the pollutants remained high concentration, indicating that a large improvement in winter air quality in Henan Province will face great challenges in the future. Secondary inorganic aerosols and organic matter were the main components of PM_2.5 during the observation periods. During the mid-holiday outbreak, the three cities were less affected by fireworks, and the contribution of nitrate and dust decreased slightly compared to before the pre-holiday. After the holiday, the proportions of nitrate decreased by 10.6%, 4.1%, and 4% in Zhengzhou, Anyang, and Xinxiang, respectively. In contrast, the proportions of sulfate and secondary organic carbon increased. Taking Zhengzhou City as an example to analyze the formation of nitrate, compared to pre-holiday, the proportions of nitrate under different pollution levels in the post-holiday outbreak have decreased, but nitrate was still the highest proportion of PM_2.5 during the polluted period. The characteristics of diurnal variation indicate that the increase in O₃ concentration and humidity in the atmosphere during the post-holiday outbreak may promote the conversion of NO₂. Therefore, the next step should be to adopt the coordinated management and control of PM_2.5 and O₃ and pay attention to the coordinated reduction of NO₂ and VOCs.

Key words： COVID-19 outbreak PM_2.5 chemical component nitrate emission reduction effect

Received: 08 April 2020

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X513

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	WANG Shen-bo
	FAN Xiang-Ge
	HE Bing
	ZHANG Rui-qin
	WANG Ling-ling

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WANG Shen-bo,FAN Xiang-Ge,HE Bing等. Chemical composition characteristics of PM_2.5 in Henan Province during the Spring Festival and COVID-19 outbreak[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5115-5123.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5115

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