page_title: NIOSH air filtration rating
hierarchical_section_title: NIOSH air filtration rating
caption_attribution_description: English: A half-face air-purifying respirator equipped with a cartridge that contains both a P-100 particulate filter and organic vapor (OV) filtering media. The respirator is attached to the wearer's face to provide purified air during activities where particulates and organic vapors are present.
context_page_description: The NIOSH air filtration rating is the U.S. National Institute for Occupational Safety and Health's classification of filtering respirators. The ratings describe the ability of the device to protect the wearer from dust and liquid droplets in the air. The certification and approval process for respiratory protective devices is governed by Part 84 of Title 42 of the Code of Federal Regulations. Respiratory protective devices so classified include air-purifying respirators such as filtering facepiece respirators and chemical protective cartridges that have incorporated particulate filter elements.
  The classifications only cover the filtration of particles or aerosols, not the air-purifying respirator's ability to remove chemical gasses and vapors from air, which is regulated under 42 CFR 84 Subpart L. The classifications assume that the respirator is properly fitted.
context_section_description: The NIOSH air filtration rating is the U.S. National Institute for Occupational Safety and Health (NIOSH)'s classification of filtering respirators. The ratings describe the ability of the device to protect the wearer from dust and liquid droplets in the air. The certification and approval process for respiratory protective devices is governed by Part 84 of Title 42 of the Code of Federal Regulations (42 CFR 84). Respiratory protective devices so classified include air-purifying respirators (APR) such as filtering facepiece respirators (dust masks) and chemical protective cartridges that have incorporated particulate filter elements. 
  The classifications only cover the filtration of particles or aerosols, not the air-purifying respirator's ability to remove chemical gasses and vapors from air, which is regulated under 42 CFR 84 Subpart L. For more information see Cartridge (respirator). The classifications assume that the respirator is properly fitted.
caption: Half-face air-purifying respirator with combination P100 particulate filter (magenta) and organic vapor (black) cartridge
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