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. 2021 Sep 15;204:112065. doi: 10.1016/j.envres.2021.112065

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© 2021 Published by Elsevier Inc.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 3 — Forest plots of the association between short-term exposure to air pollutants and COVID-19 risk. AQI, air quality index; CO, carbon monoxide; NO₂, nitrogen dioxide; O₃, ozone; PM₁₀, particulate matter with diameter <10 μm; PM_2.5, particulate matter with diameter <2.5 μm; SO₂, sulfur dioxide.