Effects of COVID-19 lockdowns on fine particulate matter concentrations

Melanie S. Hammer, Aaron Van Donkelaar, Randall V. Martin, Erin E. McDuffie, Alexei Lyapustin, Andrew M. Sayer, N. Christina Hsu, Robert C. Levy, Michael J. Garay, Olga V. Kalashnikova, Ralph A. Kahn