A risk assessment is methods used to quantify risks to human health and the environment.

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Other /More definition:
A risk assessment is "Qualitative and quantitative evaluation of the risk posed to human health and/or the environment by the actual or potential presence and/or use of specific pollutants" (EPA 1992, 25).

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Other /More definition:
A risk assessment is a scientific process that includes hazard identification, receptor characterization and endpoint selection, stress-response assessment, and risk characterization.