@joeinwynnewood @GreySkies @augieray If you want some home empiricism, finish sand—meaning use a fine grit—a lot of pine in various masks and see what's in the mask at the end of the day.
Elastomerics got created in industrial contexts for a reason. Simple disposable masks, even N95s, tend to leak if you move your face much or after twenty minutes and the nose bridge doesn't hold its shape. That's because they have to be cheap enough to be disposable.
Elastomerics work better and cost less.
@graydon @GreySkies @augieray
The real question is whether or not near 100% filtering of airborne virus is required to prevent infection.
I'm hard pressed to believe this is the case when current (administration within past 6 months) on the latest vaccination formulation (bivalent as of now).