3 ms·
Incorrect. A mask rated N95 filters out more than 95% of particles (PM) larger than 0.3 microns — that’s much smaller even than PM2.5 microns. Certified 3M N95
by toephu2 8y ago
Incorrect. A mask rated N95 filters out more than 95% of particles (PM) larger than 0.3 microns — that’s much smaller even than PM2.5 microns. Certified 3M N95 rated masks are sold all over China.
- kaybe 8y agoThe question is how much air bypasses the masks at the sides. The holes there are huge and any air that passes there will basically have the full smaller particle load. Do the masks produce considerably more resistance to breathing if you press them on with your hands? That would be a sign of this happening.