NIOSH Guide to the Selection and Use of Particulate Respirators Certified Under 42 CFR 84/Abbreviations
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ABBREVIATIONS
| APF | assigned protection factor |
| CFR | Code of Federal Regulations |
| DFM | dust, fume, and mist |
| DHHS | U.S. Department of Health and Human Services |
| DM | dust and mist |
| DOP | dioctyl phthalate |
| HEPA filter | high-efficiency particulate air filter |
| HR | hazard ratio |
| IDLH | immediately dangerous to life and health |
| MMAD | mass median aerodynamic diameter |
| MSHA | Mine Safety and Health Administration |
| NaCl | sodium chloride |
| NIOSH | National Institute for Occupational Safety and Health |
| OSHA | Occupational Safety and Health Administration |
| PAPR | powered air-purifying respirator |
| PEL | permissible exposure limit |
| REL | recommended exposure limit |
| SCBA | self-contained breathing apparatus |
| TB | tuberculosis |