Sources of Uncertainty

Exposure measurements and estimates are difficult to obtain, and full of uncertainty. Often, less data exists about human exposure to chemicals than about chemicals' inherent toxicities. When estimating chemical exposure, it is important to be aware that exposure can come from different sources at varying rates—some intermittent, others continuous. Frequently, people assume that exposure comes from only one source and that they only need to monitor levels from that source. However, people may be exposed to different sources at various times and in various quantities. These considerations make estimating exposure very difficult. Below are some sources of uncertainty in estimating chemical exposure.

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