Science & Technology

EPA Region 4 to Review Cleanups at 55 Southeast Superfund Sites in 2026  

Release Date: December 4, 2025

Computational Toxicology and Exposure APIs: Clients

Client API packages have been developed to support access to the Computational Toxicology and Exposure APIs (CTX APIs)

Designation and NAAQS Information Related to PM-2.5 (2012 Standard)

Designation and NAAQS Information Related to PM-2.5 (2006 Standard)

Designation and NAAQS Information Related to PM-2.5 (1997 Standard)

Designation and NAAQS Information Related to PM-10 (1987 Standard)

Designation and NAAQS Information Related to 8-Hour Ozone (2008)

Designation and NAAQS Information Related to 8-Hour Ozone (1997 Standard) - NAAQS Revoked

Designation and NAAQS Information Related to Nitrogen Dioxide (1971 Standard)

United States 2030 Food Loss and Waste Reduction Goal

On September 16, 2015, the United States Department of Agriculture (USDA) and the United States Environmental Protection Agency (EPA) announced the first ever domestic goal to reduce food loss and waste by half by the year 2030.

NATA Limitations

Summary of the limitations of the 2005 NATA

NATA Overview

Background information about the National Air Toxics Assessment - what it is and how to use the data

2005 NATA: Assessment Methods

Information about assessment methods used in the 2005 NATA assessment

2005 National Air Toxics Assessment

Background information on the 2005 National Air Toxics Assessment

2014 NATA: Assessment Methods

Information about assessment methods used in the 2014 NATA assessment

2011 National Air Toxics Assessment

Background information on the 2011 National Air Toxics Assessment

Download Hazardous Air Pollutant Exposure Model (HAPEM)

The HAPEM model has been designed to estimate inhalation exposure for selected population groups to various air toxics.

Hazardous Air Pollutant Exposure Model (HAPEM) User's Guides

Human exposure modeling relates pollutant concentrations in the larger environmental media to pollutant concentrations in the immediate exposure media.

Supporting Documentation APEX/TRIM.Expo Inhalation Model

Human exposure modeling relates pollutant concentrations in the larger environmental media to pollutant concentrations in the immediate exposure media.

MIMS for TRIM

MIMS supports complex computational studies that use multiple interrelated models / programs, such as the modules within TRIM. MIMS is used by TRIM to run various models in sequence, while sharing input and output files.