Top 10 Best Reusable Air Pollution Masks in 2020 (Base ...
Sep 17, 2020·An easy way to see the filtering power of a mask is by checking to see if it has a NIOSH rating of N95 or N99, meaning that it filters out 95% or 99% of particles 0.3 microns or larger, respectively. N95 is considered good enough for getting through smoky or polluted air.