The CDC warns of counterfeit N95/KN95 masks

The CDC's masks page is full of useful information about what makes a mask good at blocking germs. I'm afraid I have bad news about that unbranded box of 'coffee filter' masks you got online.

Counterfeit (fake) KN95 respirators. BE AWARE: About 60% KN95 respirators in the United States are counterfeit (fake) and DO NOT meet NIOSH requirements. — Read the rest