IDLH

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IDLH ( Immediately Dangerous to Life and Health ) is a reference value for the maximum concentration of a substance in the air at which, if you escape within 30 minutes, you will not suffer any serious or permanent damage. The IDLH value was created by American authorities in the 1970s because they wanted to know the substance-specific concentration that would still ensure escape if a breathing apparatus failed.

Problem areas

Problem areas of this value are that the definition of the protection goal only includes imprecise markings of the severity of tolerated effects. In addition, the procedure for time extrapolation to 30 minutes is comparatively schematic. As a third point, it should be noted that the data is only evaluated at the level of secondary literature and the justification for the values ​​is correspondingly inaccurate.

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