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2
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The maximum exposure to a biologically active physical or chemical agent that is allowed during an 8-hour period (a workday) in a population of workers, or during a 24-hour period in the general population, which does not appear to cause appreciable harm, whether immediate or delayed for any period, in the target population. (From Lewis Dictionary of Toxicology, 1st ed)
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1
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3
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--subdivision Threshold limit values under individual chemicals and groups of chemicals, e.g. Copper--Threshold limit values
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1
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