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. 2021 Jan 7;768:144796. doi: 10.1016/j.scitotenv.2020.144796

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© 2020 Published by Elsevier B.V.

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. 2 — Comparison of diurnal variation of predicted the major oxidants and the changes between cases in three major cities during the pre-COVID (purple squares represent Pre) and COVID-lock periods (yellow squares represent Case 1 in COVID-19 lockdown and green squares represent Case 2).