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. 2020 Dec 5;188:107506. doi: 10.1016/j.buildenv.2020.107506

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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. 6 — Variations of airborne infection risk and reproduction number with normalized mean rebreathed fraction.

Note: The data are calculated from Equations (10), (11) with the quantum generation rate of 142 quanta/h and the mask efficiency of 65%.