This informational booklet provides a generic, non-exhaustive overview of a particular topic related to OSHA standards. It does not alter or determine compliance responsibilities in OSHA standards or theOccupational Safety and Health Act of 1970. Because interpretations and enforcement policy may change over time, you should consult current administrative interpretations and decisions by the Occupational Safety and Health Review Commission and the Courts for additional guidance on OSHA compliance requirements.| Hazard | Respirator |
| Immediately dangerous to life or health (IDLH) 2 | |
| Oxygen deficiency Gas, vapor contaminants and other highly toxic air contaminants |
Full-facepiece, pressure-demand SCBA certified for a minimum service life of 30 minutes. A combination full-facepiece, pressure-demand SAR with an auxiliary self-contained air supply. |
| Contaminated atmospheres - for escape | Positive-pressure SCBA. Gas mask. Combination positive-pressure SAR with escape SCBA. |
| Not immediately dangerous to life or health | |
| Gas and vapor contaminants | Positive-pressure SAR. Gas mask. Chemical-cartridge or canister respirator. |
| Particulate contaminants | Positive-pressure SAR including abrasive blasting respirator. Powered air-purifying respirator equipped with high-efficiency filters. Any air-purifying respirator with a specific particulate filter. |
| Gaseous and particulate contaminants | Positive-pressure supplied respirator. Gas mask. Chemical-cartridge respirator with mechanical filters. |
| Smoke and other fire-related contaminants | Positive-pressure SCBA. |