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. 2022 Oct 6;1(5):pgac223. doi: 10.1093/pnasnexus/pgac223

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© The Author(s) 2022. Published by Oxford University Press on behalf of National Academy of Sciences.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1. — Viral particles are exhaled by an infected person at a concentration C_e. They are dispersed by drafts (velocity ), which lead to a decrease of their concentration. The dispersion cone must not be confused with the conical shape of high-speed jets in a fluid at rest (19, 31, 32). In an indoor space, viral particles are stored, which translates into a background homogeneous concentration , controlled by the ventilation rate Q.

Inline graphic — Viral particles are exhaled by an infected person at a concentration C_e. They are dispersed by drafts (velocity ), which lead to a decrease of their concentration. The dispersion cone must not be confused with the conical shape of high-speed jets in a fluid at rest (19, 31, 32). In an indoor space, viral particles are stored, which translates into a background homogeneous concentration , controlled by the ventilation rate Q.