09-24-2020, 06:06 PM
Apparently 70% of KN95 masks don't meet the criteria for N95 filtration (that doesn't mean throw yours out; it is probably doing something).
https://www.usatoday.com/story/news/heal...806327002/
BC
https://www.usatoday.com/story/news/heal...806327002/
BC
