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. 2020 Dec 21;271:116326. doi: 10.1016/j.envpol.2020.116326

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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. 2 — The plots show the effect on the spread of COVID-19 when associated to (a) Air quality deficiency, (b) country income group, days since the first COVID-19 case by (c) region and by (d) country-income group. The COVID-19 spread units are based on rates via the offset as produced by the related models.