The term immediately dangerous to life or health (IDLH) as exposure to airborne contaminants that is “likely to cause death or immediate or delayed permanent adverse health effects or prevent escape from such an environment.” Examples include smoke or other poisonous gases at sufficiently high concentrations.in this situations SCBA A(self-contained breathing apparatus ) will help to worker.A self-contained breathing apparatus (SCBA) is a device worn by rescue workers, firefighters, and others to provide breathable air in an immediately dangerous to life or health atmosphere (IDLH).
