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NIOSH: Documentation for Immediately Dangerous to Life or Health Concentrations (IDLH) - idlh-1 (179 words) |
 | 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. |
| NIOSH is currently evaluating the scientific adequacy of the criteria and procedures used during the SCP for establishing IDLHs. |
| 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). |
| SOP 3-II-10 2 IN 2 OUT (1293 words) |
| IDLH Atmosphere: An atmospheric concentration of any toxic, corrosive or asphyxiant substance that poses an immediate threat to life or would cause irreversible or delayed adverse health effects or would interfere with an individuals ability to escape from a dangerous atmosphere. |
| If the presence of an "IDLH atmosphere" has been determined, and there are less than 5 qualified firefighters on the scene, the companies shall wait until at least 5 qualified firefighters are assembled on the scene before initiating operations within the IDLH atmosphere. |
| Two qualified firefighters may begin operating within the IDLH atmosphere as long as two additional qualified firefighters (properly equipped) are outside the IDLH atmosphere to serve as the initial rapid intervention team (RIT), and one person maintains the operation of the pump. |
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