thought this was useful…
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Tips for dodging the virus as Americans retreat from colder weather: Open the windows, buy an air filter — and forget the UV lights. …
For a classroom or office, a portable air cleaner suited to the room’s size “is a great low-cost plug-and-play strategy to give you several air changes per hour of clean air,” Dr. Allen said. These are compact devices that can be plugged into any outlet; effective models are available for less than $200.
Some people mistakenly think that the average air filter, portable or part of a larger system, is no match for the microscopic virus. But “the virus is not naked in the air,” Dr. Marr said. “It comes out in respiratory droplets.”
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https://www.nytimes.com/2020/09/27/health/coronavirus-transmission-indoors.html
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