IDLH
IDLH (immediately dangerous to life or health) is the atmospheric concentration of any toxic, corrosive or asphyxiant substance that can:
  • Pose an immediate threat to life
  • Cause irreversible or delayed adverse health effects
  • Interfere with an individual's ability to escape from a dangerous atmosphere
For more information, see: Documentation for Immediately Dangerous to Life or Health Concentrations, National Institute for Occupational Safety and Health.
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