I'm wearing a homemade cloth mask with a PM2.5 filter
Posted on: April 30, 2020 at 13:21:42 CT
MrBlueSky MU
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Because PM2. 5 filters are shown to be effective in blocking the vast majority of airborne particulates, even the very smallest nanoparticles. The PM2. 5 name comes from these filters' original use as protection against Particulate Matter 2.5, the smallest and most dangerous form of air pollution.