RT Journal Article SR Electronic T1 Air quality in Mexico City during the COVID-19 lockdown possibly decreased COPD exacerbations JF ERJ Open Research JO erjor FD European Respiratory Society SP 00183-2022 DO 10.1183/23120541.00183-2022 A1 Francisco Montiel-Lopez A1 Daniela Rodríguez-Ramírez A1 Maricruz Cassou-Martínez A1 María Cristina Miranda-Márquez A1 Claudia González-González A1 Raúl H. Sansores A1 María Eugenia Mayar-Maya A1 Rogelio Pérez-Padilla A1 Robinson Emmanuel Robles-Hernández A1 Ireri Thirion-Romero A1 Oliver Pérez-Bautista A1 Alejandra Ramírez-Venegas YR 2022 UL http://openres.ersjournals.com/content/early/2022/06/30/23120541.00183-2022.abstract AB