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NIOSH: Documentation for Immediately Dangerous to Life or Health Concentrations (IDLH) - idlh-1 (179 words) |
 | NIOSH: Documentation for Immediately Dangerous to Life or Health Concentrations (IDLH) - idlh-1 |
| IDLHs were originally determined for 387 substances in the mid-1970's as part of the Standards Completion Program (SCP), a joint project by NIOSH and the Occupational Safety and Health Administration (OSHA), for use in assigning respiratory protection equipment. |
| In this document, IDLHs are listed with the basis and references for the current values as well as with the original IDLHs and their documentation (as paraphrased from the SCP draft technical standards). |
| NIOSH: Documentation for Immediately Dangerous to Life or Health Concentrations (IDLH) / Introduction - idlhintr (2643 words) |
| The Documentation for Immediately Dangerous to Life or Health Concentrations (IDLHs) is a compilation of the rationale and sources of information used by NIOSH during the original determination of 387 IDLHs and their subsequent review and revision in 1994. |
| The concept of using respirators to protect workers in situations that are immediately dangerous to life or health was discussed at least as early as the 1940's. |
| IDLHs could not be determined during the SCP for 22 substances (e.g., bromoform and calcium oxide) because of a lack of relevant toxicity data and therefore the designation "UNKNOWN" was used in the IDLH listing. |
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