Science of The Total Environment | Autores: Oscar Peralta, Abraham Ortínez-Alvarez, Ricardo Torres-Jardón, Manuel Suárez-Lastra, Telma Castro, Luis Gerardo Ruíz-Suárez* * Ciencias Ambientales | Centro de Ciencias de la Atmósfera Abstract uring the COVID-19 pandemic lockdown, emissions of primary criteria pollutants in the Mexico City Metropolitan Area (MCMA) were substantially reduced, as in many other cities