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. 2020 Jul 31;746:141320. doi: 10.1016/j.scitotenv.2020.141320

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© 2020 Published by Elsevier B.V.

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 — April average concentrations of NO₂, CO, SO₂, O₃, PM_2.5 and PM₁₀ for the years 2010–2020 as measured by a ground station over Hat Yai, Thailand. April is the month of 2020 when the city was completely under lockdown.