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. 2020 Dec 29;66:102688. doi: 10.1016/j.scs.2020.102688

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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. 6 — Boxplot distributions of MODIS AOD (A), OMI NO₂(B), PM_2.5(C), PM₁₀(D), NO₂(E), SO₂(F), O₃(G) and CO (H) during baseline (2017 to 2019) and lockdown (2020) periods in six cities.