science

N95 masks have an electrstatic layer that removes particles (such as viruses) that are much smaller than the mask pores. The size of the pores is almost immaterial at that scale.

Also, Covid is an aerosol virus, not droplets. The difference is that droplets are large enough to fall to the ground due to gravity, while aerosols linger in the air like smoke. The idea that it was droplets led to the idea of 6 foot social distancing, which would give the particles time to fall to the ground. But that doesn't work. You really need filtration, such as masks and/or HEPA filters. UVC light is also showing some promise for killing the virus in the air, but N95's are tried and true.