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Documentation for immediately dangerous to life or health concentrations (IDLHs)
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May 1994
[PDF-9.94 MB]
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Description:This publication documents the criteria and information sources that have been used by the National Institute for Occupational Safety and Health (NIOSH) to determine immediately dangerous to life or health concentrations (IDLHs). 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 the interim, the IDLHs have been reviewed and, (if appropriate) revised. 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).
1994-IDLH-ValuesBackgroundDocs.pdf
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