A new NIOSH publication, “A Guide to Air-purifying Respirators,” provides information on selecting an appropriate respirator based on the environment and contaminants in a particular situation. The guide was published Sept. 5, N95 Day, a day NIOSH sets aside annually to emphasize the importance of the proper use of NIOSH-approved N95 filtering facepiece respirators in the workplace. The agency’s new guide () includes information on filtering facepiece respirators, elastomeric half facepiece respirators, elastomeric full facepiece respirators, and powered air-purifying respirators. Air-purifying respirators remove gases, vapors, aerosols, or a combination of contaminants from the air using filters, cartridges, or canisters. NIOSH notes that these respirators cannot be used in an atmosphere that is oxygen-deficient or immediately dangerous to life or health because they do not supply oxygen from other than the working atmosphere. AIHA is an official partner of NIOSH’s N95 Day. NIOSH encourages employers, respiratory protection program managers, and safety managers in all industries that rely on N95 respiratory protection to take time on N95 Day to focus on safety and familiarize themselves with NIOSH’s resources on respiratory protection.