Last Revised: January 06, 2022
Issued 4/15/2020
Revised 4/24/2020 with surgical-style mask information
Revised 5/4/2020 with one-way exhalation valve information
Revised 5/19/2020 with Non-NIOSH Approved and Counterfeit Respirators
Revised 7/27/20 with Penn cloth face covering
Revised 9/28/20 updated language
Revised 1/20/21 with general KN95 use information
Revised 3/19/2021 with 3M counterfeit respirators
Removed 1/5/22
Face Covering or respirators with one-way exhalation valve
Non-NIOSH Approved and Counterfeit Respirators