So frustrating. It’s December and Americans still do not have a reliable method for getting higher-grade masks. In North Carolina, Food Lion sells KN95 masks registered with the FDA. I can’t vouch for anything else. People are at the mercy of scammers. We need a certified supply. https://twitter.com/kieniastrees/status/1336665669232979975 …
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It is also bad advice because it assumes fit is good in all masks it is being compared to. Just as likely to have improper fit with other masks which of course causes same issues.
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This just isn’t true, medical masks are explicitly designed to filter without a tight fit, N95s are specifically designed to filter when sealed. The difference is in how much resistance is in the filter, N95 have higher resistance so when the seal is broken air finds alt pathways
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