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. 2022 Feb 9;10(2):410. doi: 10.3390/biomedicines10020410

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Time-series of maximum PM_2.5 24-h averages at MMC and estimated daily 24-h averages at MAVH January 2019 to May 2020—including the 11 m study period—classified according to the US EPA AQI index. The blue continuous line depicts the 24-h average WHO guideline. The blue shade area represents the beginning of the COVID-19 official lockdown in Mexico. Air quality data were available from the Sistema de Monitoreo Atmosférico del Gobierno de la Ciudad de México (http://www.aire.cdmx.gob.mx/default.php, accessed on 29 December 2021 and Sistema Nacional de Información de la Calidad del Aire. Instituto Nacional de Ecología y Cambio Climático (INECC), México (http://sinaica.inecc.gob.mx/data.php, accessed on 29 December 2021).