I think the point of this is that aerosol droplets can penetrate any of the common masks in use so they provide zero prevention, the exception possibly being cough/spit size droplets.
“I think the point of this is that aerosol droplets can penetrate any of the common masks in use so they provide zero prevention, the exception possibly being cough/spit size droplets.”
Well, now I think that’s overstated in the other direction. Not all zero sum.