Science & Technology

Hazardous Air Pollutant Exposure Model (HAPEM) Versions

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

Human Exposure Assessment and Modeling - Criteria Air Pollutant Exposure Assessment

Summaries of exposure assessments performed for criteria air pollutants in the context of NAAQS reviews.

Urban Waters and the Blue River (Kansas City, Missouri)

This page provides background information on the Middle Blue River area one of the 19 Designated Urban Waters Locations.

Contacts for Grand River (Grand Rapids)

Contact information for Grand Rapids Grand River urban waters partnership

Middle Rio Grande - Slides from May 1, 2017

Presentation on the Middle Rio Grande Urban Waters Partnership, May 1, 2017

Water Infrastructure Decontamination Bench and Pilot Scale Studies

EPA conducts research at the bench and pilot scales to understand contaminant fate, transport and persistence on drinking water pipe materials. This research takes place at EPA’s Test and Evaluation facility in Cincinnati, Ohio.

2020 National Emissions Inventory (NEI) Data

2020 National Emissions Inventory

Clarification Memo on Additional Methods, Determinations, and Analyses to Modify Air Quality Data Beyond Exceptional Events

Additional Methods Determinations

Exceptional Events Documents Particulate Matter - Kennewick, WA

Exceptional Events Documents Ozone - Kennewick, WA

Exceptional Events Documents Ozone - Colorado

Exceptional Events Documents Ozone - Louisiana

Exceptional Events Documents Ozone - Maryland

Exceptional Events Documents Particulate Matter - Albuquerque, NM

Exceptional Events Documents Ozone - Albuquerque, NM

Guidance on the Preparation of Demonstrations in Support of Requests to Exclude Ambient Air Quality Data Influenced by High Wind Dust Events Under the 2016 Exceptional Events Rule

High Wind Dust Event Guidance