Which data source provides estimates of intake under various scenarios?

• A. Environmental monitoring data
• B. Biomonitoring data
• C. Exposure modeling data
• D. In vitro toxicity data

Answer: (C)

Intake estimates across different scenarios come from exposure modeling. This approach builds mathematical representations of how people encounter a chemical, adjusting inputs for the scenario: who is exposed (age, body weight), how they are exposed (inhalation, ingestion, dermal), how often and for how long, and how products are used. By tweaking these factors, the model can estimate daily or lifetime intakes for diverse situations—such as a toddler mouthing objects, an adult in a workplace, or a consumer using a product at home—and can also quantify variability and uncertainty with probabilistic methods.

Environmental monitoring provides actual concentrations in the environment, not estimates of intake across hypothetical scenarios. Biomonitoring measures internal doses in people but doesn’t directly translate to intake under varying scenarios. In vitro toxicity data relates to effects observed in cells or tissues, not to how much people ingest or absorb.