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

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© 2020 Elsevier B.V. All rights reserved.

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 — Quantitative relationship between COVID-19 reproduction ratio and PM_2.5 exposure levels and composition. Partial response plot and 95% confidence intervals (shaded region) for the transmissibility of COVID-19 with respect to PM_2.5 concentration (a) and sulfate-nitrate-ammonium (SNA; secondary inorganic aerosol) fraction (b). Tables next to the figures show the results of association analysis based on GAM fitting. For example, for PM_2.5 concentration ∈(2, 4) μg/m³, a 1.0 μg/m³ increase in PM_2.5 concentration is associated with a 0.310 (95% CI: 0.088–0.532) increase in ${\bar{R}}_{0}$ .