Science & Technology
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Particulate Matter (PM) Air Quality Standards - Documents Prior to Review Completed in 1997
Particulate Matter (PM) Air Quality Standards - Documents Prior to Review Completed in 1997
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2019 AirToxScreen: Assessment Results
Downloadable results files related to the 2019 AirToxScreen assessment.
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APEX User Guides
The Air Pollutants Exposure model (APEX) is part of EPA’s overall Total Risk Integrated Methodology (TRIM) model framework
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Total Risk Integrated Methodology (TRIM) Air Pollutants Exposure Model Documentation (TRIM.Expo/APEX, Version 5.2)
The Air Pollutants Exposure model (APEX) is part of EPA’s overall Total Risk Integrated Methodology (TRIM) model framework (EPA, 1999).
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Memorandum: Develoment of Penetration and Proximity Microenvironment Factor Distributions for HAPEM5
Human exposure modeling relates pollutant concentrations in the larger environmental media to pollutant concentrations in the immediate exposure media.
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AirToxScreen Risk Drivers
AirToxScreen emissions update document
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2018 AirToxScreen: Assessment Results
Downloadable data files related to the 2018 AirToxScreen
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2017 AirToxScreen: Assessment Results
Downloadable data files related to the 2017 AirToxScreen
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EPA Tools and Resources Webinar Series
EPA’s Office of Research and Development (ORD) hosts the EPA Tools and Resources webinar, a monthly public webinar featuring presentations to share EPA resources and information that are useful, practical/applied and available to meet state research needs.
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Chemicals under the Toxic Substances Control Act (TSCA)
This web area will allow stakeholders to search and view centralized chemical info from various systems. This page will focus on TSCA chemical data such as health and safety studies, risk assessments and hazard characterizations.
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Green Book Nitrogen Dioxide (1971) Area Information
Nitrogen Dioxide (1971)
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Green Book Disclaimer
Disclaimer for the Green Book
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Green Book Areas with a Maintenance Plan Requirement Under Section 110(a)(1) of the CAA
Areas with a Maintenance Plan Requirement Under Section 110(a)(1) of the CAA
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Harmful Algal Blooms, Hypoxia, and Nutrients Research Webinar Series
EPA's HABS, Hypoxia, and Nutrients Webinar Series hosts bi-monthly webinars to share information on recent research, technology, and tools.
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Past Webinars : Harmful Algal Blooms, Hypoxia, and Nutrients Research Webinar Series
information for the January 30, 2024 Small Systems webinar
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Why isn’t there an outdoor air monitor in my county?
EPA and its partners in State, local, and tribal air monitoring programs work closely to design and implement ambient air monitoring networks to meet multiple monitoring objectives including: providing air pollution data to the general public in a timely manner; supporting compliance with the National Ambient Air Quality Standards (NAAQS)…
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State-Specific Water Quality Standards Effective under the Clean Water Act (CWA)
The Environmental Protection Agency has compiled state, territorial, and authorized Tribal water quality standards (WQS) that it has approved or are otherwise in effect for CWA purposes.
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Underground Transportation Restoration Project
Description of the Underground Transportation Restoration Project
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Underground Transport Restoration (UTR) Project
page describing the HSRP's UTR project
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Premise Plumbing Modeling Tools
EPA has developed a variety of tools that can help communities understand the impact of decisions related to designing, planning, treatment, optimizing, emergency response, or managing water infrastructure systems.