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Original Articles

Adjusting occupational exposure limits for moonlighting, overtime, and environmental exposures

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Pages 727-733 | Published online: 04 Jun 2010
 

Abstract

A mathematical model is used to predict relative body burdens of inhaled contaminants in workers who work two jobs or overtime, or who experience off-the-job exposure to air contaminants. Expected “peak” or maximum body burdens from multiple exposures are compared to those expected from the “normal” occupational exposure on which TLVs and Permissible Exposure Limits (PELs) are based (five 8-hour days per week with zero off-the-job exposure). The model is designed to predict what adjustments to the TLVs and PELs are necessary to avoid accumulation of excess peak body burdens of contaminants from the additional exposures incurred. The general application of models to determine occupational exposure limits is reviewed, and several models are compared.

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