. 2021 Oct 29;18(21):11408. doi: 10.3390/ijerph182111408
© 2021 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/).
Figure 1.
Relationship between COVID-19 and smog.