Virus "water dropplets" can be 1/120th the diameter of a human hair. 1 Micron vs. 60 to 120 Microns. Nake eye visible is about 40micons or 1/2 to 1/3 the diameter of human hair.

for COVID19 virus protection for either party, you need to be filtering at 1 micron or smaller to catch the smallest water "droplets" - 40 times smaller than nake eye visible.

Droplet you can see and feel from a cough or sneeze are disgusting and probably dangerous for viral infection passing, but they're probably 100,000 10mircron or smaller droplets on the same flight path.

If anyone is truly worried about this virus, don't be fooled by a non N-95 mask as either a protector or protectee.

You will never see medical professionals using non N-95 mask unless they are not available, for good reason.