疫情期间“2+26”城市污染减排成效评估

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Abstract In order to evaluate the effect of air pollutions emission reduction in Beijing, Tianjin, Hebei and its surrounding 26 cities ("2 + 26" cities) from January to March in 2020 during the epidemic of COVID-19, the air quality model of nested air quality prediction modeling system (NAQPMS) was applied to conduct a few scenarios. The characteristics of air quality from January to March 2020, and during the periods before and after the epidemic of COVID-19 were investigated. The influences of meteorology, emergency emission reduction measures and social economic activities on ambient air quality as well as the uncertainties were elucidated and discussed. The results showed that the number of days achieving good and moderate air quality standard in "2+26" cities accounted for 59.6%, on average of 10.9% increase relative to the same period last year. The mean concentration of PM₁₀、PM_2.5、SO₂、NO₂、O₃-8h-90 per and CO-95 per in "2 + 26" cities from January to March in 2020 were 108, 76, 14, 109, 36μg/m³, and 2.3mg/m³, respectively. During the epidemic period from January 24 to March 31, the concentrations of PM₁₀, NO₂, PM_2.5, and CO decreased significantly compared with the period prior to the epidemic from January 1to 23. In contrast to January to March in 2019, the PM_2.5 concentrations of the cities along the Yan mountain and Taihang mountain increased by 1%~8% in 2020. However, the model simulations revealed that the emergency emission reduction measures potentially avoided twice of the regional heavy air pollution events, resulting in the quarterly mean PM_2.5 concentration in "2 + 26" cities reduced by 6 to 26μg/m³. Due to the influence of the Spring Festival holiday and epidemic, the traffic emissions were reduced substantially. In contrast, the emissions from the industry such as coking and thermal power did not show large variations, and the negative impact of loose coal combustion on ambient air quality may become even more severe.

Key words： COVID-19 Beijing-Tianjin-Hebei region PM_2.5 reduction effect assessment ozone meteorological impact

Received: 15 June 2020

PACS:	X831
	X51

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	ZHU Yuan-yuan
	WANG Wei
	GAO Yu-xiao
	CHU Cheng-jun
	XU Rong
	LU Ning

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ZHU Yuan-yuan,WANG Wei,GAO Yu-xiao等. Assessment of emission reduction effect in Beijing, Tianjin and surrounding 26 cities from January to March in 2020 during the epidemic of COVID-19[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 505-516.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/505

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