cross-posted from: https://mander.xyz/post/201405

N95:

Approved by the U.S. National Institute for Occupational Safety & Health (NIOSH). So, if an N95 mask is given the stamp of approval from NIOSH, it offers that certified level of protection.

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Kn95:

However, KN95s (and the similar KF94 masks) are mostly made—and vetted—in China or South Korea. If they are stamped as “NIOSH-approved,” they are actually fakes.

typos on packages

Mask will be stamped with “GB 2626-2006” or “GB 2626-2019"

The packaging must indicate the manufacturing date. Two- to three-year expiration date