Science & Technology
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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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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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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.
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Drinking Water 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.
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Stormwater & Wastewater 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.
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COVID-19: Aerosol Treatment Devices & Ozone Disinfection Webinar
EPA's ORD offers free public webinars on recent research results. Watch a pre-recorded webinar covering research on aerosol treatment devices and ozone disinfection for COVID-19.
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Decision Support Tools for Incident Response
EPA Decision Support Tools for Environmental Incidents and Natural Disasters, for use by decision makers on waste management in the pre-planning, mitigation, response, and recovery phase of an incident.
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Data Management
EPA conducts research on how to efficiently acquire data, connect the various data streams, and how to best interpret and visualize data to support data-driven decision making during CBR contamination events.
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Toxic Aromatherapy: A Melioidosis Mystery
EPA's ORD offers free public webinars on recent research results. Watch a pre-recorded webinar on decontaminating B. pseudomallei and how the research was used to develop sampling and remediation plans for a property.