id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-264206-u9c8rrrv	Pata, Ugur Korkut	How is COVID-19 affecting environmental pollution in US cities? Evidence from asymmetric Fourier causality test	2020-07-15		.txt	text/plain	3412	186	54	In the equation, y t represents the vector containing the variables of COVID-19 cases and deaths, and PM 2.5 emissions, β is the coefficients matrix, t is the trend, T denotes the number of observations, γ 1 and γ 2 are the coefficients of the Fourier approximation that smooth structural shifts are captured, and d max is the maximum integration degree of the series that can be determined by a unit root test. The findings of the asymmetric Fourier causality test illustrate that an increase in the number of cases reduces PM 2.5 emissions in Los Angeles, Chicago, Phoenix, Philadelphia, San Antonio, and San Jose. The results of the asymmetric Fourier causality test demonstrate that an increase in the number of deaths reduces the release of PM 2.5 emissions in New York, San Diego, and San Jose. The results of the asymmetric Fourier causality test demonstrate that COVID-19 reduces PM 2.5 emissions in US cities.	./cache/cord-264206-u9c8rrrv.txt	./txt/cord-264206-u9c8rrrv.txt