The mask also "slows down" the exhaust making airosoles which escaped the mask of the infected person "be" more around that person, instead of further spread.
Which combined with e.g. a air filter system which pulls out air (instead of pushing it in) can reduce the risk by quite a bit (especially if the system is installed at the ceiling). Or so I have heard.
Which makes me wonder if you could "invert" and AC to act as such system in a improvising manner.
I think there are also AC, which do both: Pushing in fresh air and pulling out old air. Which probably have the best chances to reduce infection, especially if combined with wearing at least some kind of mask.
Which combined with e.g. a air filter system which pulls out air (instead of pushing it in) can reduce the risk by quite a bit (especially if the system is installed at the ceiling). Or so I have heard.
Which makes me wonder if you could "invert" and AC to act as such system in a improvising manner.
I think there are also AC, which do both: Pushing in fresh air and pulling out old air. Which probably have the best chances to reduce infection, especially if combined with wearing at least some kind of mask.