Yes, trying to fix

Check out a N95 respirator, which as Wikipedia says (if you trust this source): N95 standard of air filtration, filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84 https://en.wikipedia.org/wiki/N95_respirator.

Would a mask filter them?

but that's not even a little funny