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192183 
Technical Report 
Documentation for immediately dangerous to life or health concentrations (IDLHs) 
Ludwig, HR; Cairelli, SG; Whalen, JJ 
1994 
National Institute for Occupational Safety and Health 
Cincinnati, OH 
530 
English 
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 (IDLH) values. IDLH values 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 IDLH values. In the interim, the IDLH values have been reviewed and, (if appropriate) revised. In this document, IDLH values are listed with the basis and references for the current values as well as with the original IDLH values and their documentation (as paraphrased from the SCP draft technical standards). 
PB94-195047