Chemical risk assessment: a review

Area of Science:

• Environmental Health
• Toxicology
• Risk Management

Background:

• Human exposure to diverse chemicals necessitates understanding potential health risks.
• Informed decisions require a robust method for evaluating chemical exposure risks.
• Risk assessment evolved to identify, characterize, and quantify human health risks.

Purpose of the Study:

• To outline the necessity and evolution of the risk assessment process for chemical exposures.
• To detail the components and methodologies of quantitative risk assessment (QRA).
• To examine uncertainties within risk assessment and explore advancements in addressing them.

Main Methods:

• The study describes the four key components of formalized risk assessment: hazard identification, toxicity assessment, exposure assessment, and risk characterization.
• It discusses the use of experimental and epidemiological data in quantitative risk assessment.
• The examination includes analysis of modeling methods, pharmacodynamics, exposure data, assumptions, and extrapolations.

Main Results:

• Risk assessment is an essential tool for regulatory decision-making regarding chemical exposures.
• Quantitative risk assessment (QRA) provides a numerical estimate of the probability of harm.
• Uncertainties in risk assessment arise from knowledge gaps and are addressed through models and assumptions.

Conclusions:

• Despite inherent uncertainties, risk assessment is crucial for managing chemical exposure risks.
• Advancements in modeling, laboratory techniques, and epidemiological data enhance risk assessment accuracy.
• Current research focuses on directly addressing, quantifying, and managing uncertainty in the risk assessment process.