I recently read an article on a tool created by MIT where you can tweak all kids of parameters to determine how long a space is safe if a single infected person is inside. We're curbside now, but thinking ahead to when we can roll back to in library services, even limited.

Article:

https://www.fastcompany.com/90580290/one-person-in-the-room-with-you-has-covid-19-heres-how-long-it-takes-to-get-infected

 Direct link to tool: https://indoor-covid-safety.herokuapp.com/

Apologies if this has been shared already and I missed it.