@article {wu2020air,
	title = {Air pollution and COVID-19 mortality in the United States: strengths and limitations of an ecological regression design},
	journal = {Climatological, Meteorological, and Environmental factors in the COVID-19 pandemic},
	year = {2020},
	publisher = {AGU},
	author = {Wu, Xiao and Nethery, Rachel C and Sabath, M Benjamin and Braun, Danielle and Francesca Dominici}
}
