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I think masks at best can slow that buildup in a room so what would take, say, 10 minutes of being in a room w/o mask to build up a high enough dose for transmission might take 15 minutes with a mask. But open enough windows and there will be no build up to make masks worthwhile.
The volume of air that is exhaled / inhaled is the same though, right? With a mask or without it Only a sealed n95/ffp2 mask would have this effect, but if there is no seal (and the ffp2 masks we have here, do not seal at all), the air you breathe is almost totally unfiltered.
Eh Ive done plenty jobs ripping up interiors with dust flying out, around open flames with smoke, spray painting, etc never had an issue inhaling the wrong thing despite having on whatever N95 I had, they work. Cloth though you're only catching little bits of spit that fly out
when you speak, which goes with your point they are germ collectors and it probably explains why droplet viruses have disappeared while aerosol viruses remain unscathed. The germ we want masks to trap doesnt get trapped in masks, despite many others doing so.
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