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. 2021 Jun 30;152:583–600. doi: 10.1016/j.psep.2021.06.043

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© 2021 The Author(s)

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 — Temporal patterns of daily average ground levels of O3 and NO2 concentrations in relation with Daily New Confirmed COVID-19 cases (DNC) and Daily New COVID-19 Deaths (DND) cases during the three COVID-19 pandemic waves in Madrid.