Immediately Dangerous to Life or Health (IDLH) 18 : Means an atmosphere that poses an immediate threat to life or that is likely to result in acute or immediate severe health effects
US Department of Labor, Occupational Safety & Health Administration, Shipyard Employment eTools - Glossary, Washington, DC, USA 2012. http://www.osha.gov/SLTC/etools/shipyard/glossary. html, (Shipyard Employment - Amer) {562}