id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-327628-fl8dyahe	Yuan, Qi	Spatiotemporal variations and reduction of air pollutants during the COVID-19 pandemic in a megacity of Yangtze River Delta in China	2020-08-20		.txt	text/plain	2940	149	54	The three-month period of continuous field observations for aerosol particles and gaseous pollutants, which extended from January 2020 to March 2020, covered urban, urban-industry, and suburban areas in the typical megacity of Hangzhou in the Yangtze River Delta in eastern China. Note that this public health emergency not only locked down people in the community but stopped the operation of the public traffic system and industry machine, which caused a short-term regional reduction of air pollutant emissions from vehicles and some industries in China (Huang et al., 2020b; Shi and Brasseur, 2020; The strictest nationwide restrictions for preventing the COVID-19 spread greatly reduced the primary emissions and weakened the regional transport effect of air pollutants due to the large-scale regional decrease in the primary pollution (Huang et al., 2020b; Zhang et al., 2020b) . During the observation period, the daily average mass concentrations of PM 10 , concentrations of PM 2.5 , NO x , and CO at the urban site were higher than those at the urban-industry and suburban sites (Table S2) , which suggests that vehicle emissions was the major source of air pollutants in the urban area.	./cache/cord-327628-fl8dyahe.txt	./txt/cord-327628-fl8dyahe.txt