A lot of my fellow advocates for Covid safety & clean indoor air don't seem to know some basics of messaging.

First, repetition of key points. You never know when the toot you write will be the *first* toot someone sees. So repeat the key points. #CovidIsAirborne

Covid is airborne, spread by aerosols. #P100 masks stop 99.97% of it, #N95 masks stop 95%, #HEPA filters remove 99.97% from the air.