Any situation deemed Immediately Dangerous to Life and Health. More narrowly defined by OSHA. See: main IDLH article. An area of maximum danger to firefighters. Often requires increased Personnel accountability
Wikipedia, The Free Encyclopedia, Glossary of firefighting terms, Wikimedia Foundation, CA, USA 2012. http://en.wikipedia.org/wiki/Glossary_of_firefight ing_terms, (Fr Srvc - Amer) {510}