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. 2020 Nov 9;760:143391. doi: 10.1016/j.scitotenv.2020.143391

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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. 1 — Correlation of yearly PM_2.5 exposure levels with state-wise COVID-19 reproduction number ${\bar{R}}_{0}$ (a) plot of state-wise ${\bar{R}}_{0}$ as a function of the yearly-resolved PM_2.5 concentration. The year corresponding to the PM_2.5 datasets is written on each sub-panel. (b) The map of continental US colored according to the state-wise time-averaged (between March 2 and April 30, 2020) COVID-19 basic reproduction ratio ${\bar{R}}_{0}$ , (c) the map of continental US colored according to state-level long-term average (between 2012 and 2017) PM_2.5 concentration.