新冠疫情严控期间南京市空气质量

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Abstract In order to investigate the impact of COVID-19lockdown on air quality in Nanjing, the air pollutants observed from January 25 to February 10, in 2020 (COVID-19lockdown period) in Nanjing and its surrounding cities was analyzed. During the lockdown period with poor atmospheric diffusion conditions, the concentrations of PM_2.5, PM₁₀, NO₂, SO₂, and CO decreased obviously, with the value of 36, 44, 5, 22μg/m³ and 1.1mg/m³, whereas O₃ increased by 4%. The net effectiveness of the emission reduction measures was calculated through comparisons of concentrations of air pollutants between and before COVID in the similar meteorological conditions. Concentrations of PM_2.5, PM₁₀, SO₂, NO₂ and CO decreased by 41.7%, 45.3%, 14.3%, 43.5% and 18.2%, respectively, whereas O₃ increased by 4.8%. Compared to capital cities of the Yangtze River Delta in the same period, the largest decline of SO₂ and the medium decline of the other pollutions were appeared in Nanjing. The diurnal variation concentration of PM_2.5 and PM₁₀ changed from double peak to single peak, due to the disappearance of nighttime sub-peak of particle. The concentration of O₃ increased significantly at night, which was resulted from that sharp reduction of traffic sources weaken the titration reaction of NO to O₃. The peak of O₃ during the daytime depended on the variation of the ratio of VOCs to NOx due to the emission control.

Key words： Nanjing COVID-19 lockdown period air quality emission reduction

Received: 09 December 2020

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X511

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	Articles by authors
	WANG Ai-ping
	ZHU Bin
	QIN Wei
	QIN Yan-hong
	YANG Xue
	LIU Xiao-hui

Cite this article:

WANG Ai-ping,ZHU Bin,QIN Wei等. Air quality in Nanjing during COVID-19 lockdown period[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3088-3095.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3088

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