Abstract
Closed indoor environments with prolonged contact are known to present heightened risk of Covid-19 transmission. While certain preventative measures have been proposed, they are not yet shown to be very effective. We propose a simple and potentially effective approach to mitigation of these risks in indoor environments based on possible correlation between the characteristics of the environment and the risk of transmission in the droplet and airborne channels.



![Author ORCID: We display the ORCID iD icon alongside authors names on our website to acknowledge that the ORCiD has been authenticated when entered by the user. To view the users ORCiD record click the icon. [opens in a new tab]](https://www.cambridge.org/engage/assets/public/coe/logo/orcid.png)