These 4-layer N95 masks were tested and certified by the National Institute for Occupational Safety and Health for filtering out at least 95% of airborne particles, according to the NIOSH database.

The Centers for Disease Control (CDC) updated its mask guidance last week, recommending people wear N95 or KN95 masks. “As we are entering year three of the pandemic, we’re getting more and ...

An N95 mask blocks against 95% of fine particles, while an N90 mask protects the user from 90% of pollutants. When possible, masks should be certified by the National Institute for Occupational ...

The Centers for Disease Control (CDC) updated its mask guidance last week, recommending people wear N95 or KN95 masks. “As we are entering year three of the pandemic, we’re getting more and ...

Fischer and colleagues compared four methods for decontaminating the masks, which are designed for one-time use: UV radiation (260 – 285 nm); 70° C dry heat; 70% ethanol spray; and VHP.

Level 3 masks exhibited variable filtration, with one mask at 60 ± 6% and another at 75 ± 10%. KF94, KN95s, and the KN95-lookalike mask filtered between 57% and 77%.