Between May and November 2020, the National Institute for Occupational Safety and Health (NIOSH) issued limited, temporary Public Health Emergency (PHE) approvals for N95 filtering facepiece respirators (FFRs) and powered air-purifying respirators (PAPRs) to address respirator supply shortages during that time. In July 2021, NIOSH published NIOSH CA 2021-1036 to remind PHE approval holders that these...