[Classification and risk assessment: complementary or mutually exclusive approaches?]

Area of Science:

• Toxicology and Risk Assessment
• Environmental Health and Safety

Background:

• Current classification schemes, primarily based on hazard identification (e.g., carcinogenicity, reproductive toxicity), are increasingly inadequate for modern risk management.
• These outdated systems contribute to public health scares and anxiety due to communication and perception issues.

Purpose of the Study:

• To highlight the limitations of traditional hazard identification in risk management.
• To advocate for the adoption of risk-based approaches in substance assessment and management.

Main Methods:

• The study reviews existing classification schemes and their shortcomings.
• It emphasizes the necessity of integrating human exposure estimation with hazard characterization for robust risk assessment.
• Dose-response relationships are identified as crucial for estimating safe human intake limits.

Main Results:

• Risk assessment necessitates comparing estimated human exposure levels with established safe human doses (intake limits).
• Hazard characterization, informed by dose-response data, is fundamental to determining these safe limits.

Conclusions:

• Risk-based approaches provide quantitative insights into substance potency.
• This quantitative data allows for informed, graded risk management decisions by comparing potency with exposure duration, frequency, and intensity.
• Adopting risk-based strategies enhances the ability to manage risks effectively in relation to expected exposure scenarios.