Science & Technology

Walkthrough to Install and Operate the Hydrologic Evaluation of Landfill Performance (HELP) Model v3.07

Walkthrough for Installation and Operation of the hydrologic model, HELP.

EPA Health Impact Assessment Case Studies

EPA HIA Case Studies

Rio Reimagined - Rio Salado Urban Waters Partnership

Rio Salado Salt River and Middle Gila River Watershed (AZ) location landing page

Regulatory Determination 2 Support Documents for Dacthal Mono-Acid (MTP) and Di-Acid (TPA) Degradates

Learn about the support documents for Dacthal mono- and di-acid degradates

Regulatory Determination 2 Support Document for Microorganisms on the CCL 2

Learn about the support document for microorganisms on the CCL 2

Regulatory Determination 2 Support Documents for Fonofos

Learn about the support documents for Fonofos.

Regulatory Determination 1 Support Documents for Naphthalene

Naphthalene Support Documents

Fact Sheet: Preliminary Regulatory Determination 3

Fact sheet for Regulatory Determination 3

Manufacturer-Run In-Use Testing Program Data for Heavy-Duty Diesel Engines – Test Order Year 2019

This page provides manufacturer-run in-use testing program data from heavy-duty diesel engine manufacturers in compliance with 40 CFR 86 Subpart T for Test Year 2019.

Manufacturer-Run In-Use Testing Program Data for Heavy-Duty Diesel Engines – Test Order Year 2018

This page provides manufacturer-run in-use testing program data from heavy-duty diesel engine manufacturers in compliance with 40 CFR 86 Subpart T for Test Year 2018.

Fuel Economy and EV Range Testing

EPA's National Vehicle and Fuel Emissions Laboratory (NVFEL) tests new cars and trucks sold in the U.S. to ensure that they comply with federal emissions and fuel economy standards.