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the maximum concentration of a hazardous material from which one could escape within 30 minutes with no escape-impairing symptoms or irreversible health effects. The National Institute of Occupational Safety and Health (NIOSH) recommends use of IDLH to select appropriate respirators. If adequate data does not exist for the precise establishment of the IDLH data, an independent certified industrial hygienist, industrial toxicologist, or appropriate regulatory agency should make this determination. [SEMI S2-91] .
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