[GuB-42]

> a search for N95s yields a welter of vendors hawking KN95 masks, a Chinese-made equivalent that researchers say is less effective

Any source for that?

From what I've seen, N95, KN95, FFP2 and others are pretty much equivalent. There are some small differences but none that significantly affect the level of protection. There are certainly differences between manufacturers, and maybe there are more fake KN95 than there are fake N95, but that's not an issue with the certification.

[Scoundreller]

For reasons I don’t fully understand, NIOSH absolutely requires head bands to be N95 certified. NIOSH believes a good fit is difficult enough with ear loops that they’ll never certify them.