Immediate Danger to Life and Health level

Im·me·di·ate Dan·ger to Life and Health lev·el

(IDLH) (i-mē'dē-ăt dān'jĕr līf helth lev'ĕl)
Exposure levels to toxic agents set by the U.S. National Institute of Occupational Safety and Health at which serious illness or death may occur.
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