id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-284820-29uiq6at	Wang, Junfeng	Heterogeneous Effects of COVID-19 Lockdown Measures on Air Quality in Northern China	2020-11-11		.txt	text/plain	5692	278	46	We found that the traffic restrictions, especially the restriction of intra-city travel intensity (TI), exhibited a significant heterogeneous effect on NO(2) with a decrease of approximately 13.6%, and every one-unit increase in control measures intensity reduced the concentration of air pollutants by approximately 2–4%. Our study chose data including daily air pollutant concentrations and weather conditions in the BTH region and designed a DID model to quantitatively identify the effect of control measures on air pollution during the COVID-19 outbreak. Here, real-time monitoring data from China's air pollution monitoring stations were used to demonstrate air pollutant concentration trends before and after the COVID-19 outbreak, and a DID model was used to estimate the causal effect of the implementation of lockdown measures on air quality, controlling for the interference of meteorological, vacation, and other important factors. The implementation of control measures reduced air pollution, which provided empirical evidence on the identification of the causal effect of lockdown measures on air quality during the COVID-19 outbreak.	./cache/cord-284820-29uiq6at.txt	./txt/cord-284820-29uiq6at.txt