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. 2022 Mar 25;10(4):156. doi: 10.3390/toxics10040156

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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 maxima PM_2.5 24-h averages at MMC and daily means of PM_2.5 in Hermosillo from 1 January 2019 to 31 December 2020 following the US EPA AQI index. The blue continuous line depicts the revised 24-h average guideline of the WHO. The blue shade area represents the official lockdown COVID-period in Mexico. Air quality data are available from Sistema de Monitoreo Atmosferico del Gobierno de la Ciudad de México (http://www.aire.cdmx.gob.mx/default.php accessed on 18 December 2021) and from Red Universitaria de Observatorios Atmosféricos de la Universidad Nacional Autónoma de México (https://www.ruoa.unam.mx/ accessed on 18 December 2021).