id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cord-287751-52e0tlcu	Dai, Qili	Changes in source contributions to particle number concentrations after the COVID-19 outbreak: Insights from a dispersion normalized PMF	2020-11-06		.txt	text/plain	4448	155	42	In addition to new particle formation from traffic emission with a dominant particle size ranged from ~10-30 nm as typically observed during rush hour as discussed above, a factor with particle size peaking in the nucleation mode size range (<20 nm), and characterized by high explained variations of O 3 and solar radiation with narrow DISP bands was identified as new particle formation (NPF) through photochemistry. Thus, this factor with particle sizes peaking around 30 nm was attributed to coal combustion.	cache/cord-287751-52e0tlcu.txt	txt/cord-287751-52e0tlcu.txt
