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. 2020 May 17;17(10):3493. doi: 10.3390/ijerph17103493

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© 2020 by the author.

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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Top: near real-time information on particulate matter air pollution less than 2.5 microns in diameter (PM2.5). The image refers to 15 March 2020, at 18:00 UTC. Bottom: a typical World Air Quality Index (AQI) map from IQAir.