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. 2020 Jul 14;17(14):5067. doi: 10.3390/ijerph17145067

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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Variations for each March day of 2020 compared to a baseline value, median of March concentration levels of years 2015–2019 for São Paulo MA, (a) CO and O₃, (b) NO₂ and PM_2.5. Highlighted periods in red and green correspond to maps c, d and e, f, respectively. Maps of NO₂ columns elaborated from satellite data from the European Space Agency, Tropomi Copérnico Sentinel 5P. (c,d) represent a period before the confinement. (e,f) correspond to the period of activity restriction (COVID-19 scenario).