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. 2021 Sep 4;264:118713. doi: 10.1016/j.atmosenv.2021.118713

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© 2021 The Authors

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 — Regional NO_x emissions (mol s⁻¹) trends ending on April 15 – September 15, 2020 for the BASE (black; NEI2014v2), “Business-As-Usual (BAU) (green), and COVID-19 (C19) (red) cases in the different U.S. EPA regions (https://www.epa.gov/aboutepa/regional-and-geographic-offices). Note the change in emissions scales on the y-axis. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)