An official website of the United States government.

Air: Fate, Exposure, and Risk Analysis (FERA)

The EPA uses a variety of tools, including the Total Risk Integrated Methodology (TRIM), to evaluate the health risks and environmental effects associated with exposure to "criteria" air pollutants (including photochemical oxidants, such as ozone) and toxic air pollutants. Learn about recent releases including updated files and models.

Total Risk Integrated Methodology (TRIM)

Multimedia Fate and Transport Modeling