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A concentration of airborne contaminants, normally expressed in parts per million (ppm) or milligrams per cubic meter, that represents the maximum level from which one could escape within 30 minutes without any escape-impairing symptoms or irreversible health effects. [55,2020]
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3.3.158* Definitions, Immediately Dangerous to Life and Health (IDLH)
level from which one could escape within 30 minutes without any escape-impairing symptoms or irreversible health effects. [55, 2016] ...
3.3.165* Definitions, Immediately Dangerous to Life and Health (IDLH)
level from which one could escape within 30 minutes without any escape-impairing symptoms or irreversible health effects. [55,2020] ...
53.2.3.3.13 Mechanical Refrigeration,
Discharges capable of exceeding 25 percent of the LFL or 50 percent of the immediately dangerous to life and health (IDLH) value shall be equipped ...