In a risk-based exposure assessment, which step involves estimating the relationship between exposure and health effects to guide controls?

• A. Dose-response/risk characterization
• B. Hazard identification
• C. Exposure assessment
• D. Control guidance

Answer: (A)

Estimating how exposure translates into health risk is the dose-response/risk characterization step. This stage uses data on how different exposure levels relate to the probability or severity of health effects to describe risk, often producing acceptable exposure levels or risk estimates that then inform what controls are needed and how robust they should be. Hazard identification asks what adverse effects could occur, not how risk increases with exposure. Exposure assessment focuses on how much people are exposed, not the health impact at those levels. Control guidance uses the risk information to decide what controls to implement, but it doesn’t itself establish the exposure–health relationship.