KN95 masks shouldn’t cost more than $3 apiece, according to the CDC. Additionally, it's a good idea to review lab testing documents that clearly illustrate how well a mask acts as a filter ...

Ideally, everyone (not just medical workers) should be using a KN95 or N95 mask for optimal protection when COVID cases are high or when there's a contagious variant like Omicron, according to the ...

A good mask should prevent you from extinguishing ... But the Food and Drug Administration has also approved some KN95 and FFP2 masks made in China and Europe that offer comparable protection.

California Department of Public Health officials, in an email to EdSource, said N95, KN95, and KF94 masks are the best for preventing Covid, adding “a good fit and filtration continue to be the best ...

“You want a good seal so that all of the air that’s breathed in is pulled in through the mask body. That’s where all the filtration of particles and microbial contaminants occurs.” ...