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Exposure Assessment Tools by Tiers and Types

Exposure assessment is one of the four major steps in risk assessment; others include hazard identification, dose-response assessment, and risk characterization.

Exposure may be estimated using one of several assessment tiers or types: screening-level and refined, deterministic and probabilistic, or aggregate and cumulative. Alternatively, exposure assessments may be categorized according to exposure assessment approaches, exposure media, exposure routes, lifestages and populations, or chemical classes.

Screening-Level and Refined

Screening -Level and Refined

See information and tools related to screening-level and refined

Deterministic and Probabilistic

Deterministic and Probabilistic

See information and tools related to deterministic and probabilistic

Aggregate and Cumulative

Aggregate and Cumulative

See information and tools related to aggregate and cumulative

Exposure Assessment

Exposure assessment is “the process of estimating or measuring the magnitude, frequency, and duration of exposure to an agent, along with the number and characteristics of the population exposed. Ideally, it describes the sources, routes, pathways, and uncertainty in the assessment.”

- See IPCS, 2004 Glossary of Key Exposure Assessment Terminology (PDF)(122 pp, 951 K, About PDF) developed by the International Programme on Chemical Safety

EPA ExpoBox

  • Basic Information
  • Approaches
    • - Direct Measurement
    • - Exposure Reconstruction
    • - Indirect Estimation
  • Media
    • - Air
    • - Aquatic Biota
    • - Consumer Products
    • - Food
    • - Soil and Dust
    • - Water and Sediment
  • Routes
    • - Dermal
    • - Ingestion
    • - Inhalation
  • Tiers and Types
    • - Deterministic and Probabilistic
    • - Screening-Level and Refined
    • - Aggregate and Cumulative
  • Lifestages and Populations
    • - General Population
    • - Highly Exposed
    • - Lifestages
    • - Occupational Workers
    • - Residential Consumers
  • Chemical Classes
    • - Inorganics and Fibers
    • - Nanomaterials
    • - Other Organics
    • - Pesticides
  • Exposure Factors
  • Tutorials
  • Glossaries
  • Unit Conversion
  • Uncertainty and Variability
Contact Us about ExpoBox
Contact Us about ExpoBox to ask a question, provide feedback, or report a problem.
Last updated on February 10, 2025
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