None, scientific evidence on ineffectiveness is available before and after Covid19. On my recent timeline you can find some studies.
>"None, scientific evidence on ineffectiveness is available before and after Covid19. On my recent timeline you can find some studies."
I don't see anything there about properly worn N100/P100 elastomeric respirators.
Are you implying that you have scientific evidence of effectiveness of them?
An N100 or P100 is 99.97% efficient per NIOSH.
>"Never seen anyone wear that stuff in 3 years."
Well you need to get out more. Oh wait, you can't because there's a pandemic raging...
@Pat
Never seen anyone wear that stuff in 3 years.