Science & Technology
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Report: The EPA’s Fiscal Year 2026 Top Management Challenges
Report: The EPA’s Fiscal Year 2026 Top Management Challenges
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Restoration Science Resources
Links to EPA and external information resources on the restoration of wetlands and watersheds.
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Geospatial Toolboxes
GIS toolboxes available as part of EnviroAtlas
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Exposure Assessment Models Recent Additions
Listing of recent additions and updates maintained by this website.
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Definition of "Contaminant"
Learn about the definition of a contaminant
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Regulatory Determination 2 Support Documents for DDE
Learn about the support documents for DDE
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CCL 3 Support Documents - Final CCL 3 (and other documents)
Learn about the support documents used to develop the Final CCL 3
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Fact Sheet: Third Contaminant Candidate List (CCL 3)
CCL 3 Fact Sheet
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Interactive Map of Air Quality Monitors
map of air quality monitors
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Ozone W126 Index
The impact of ozone exposure on trees, plants and ecosystems often is assessed using a seasonal index known as a "W126 index."
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Lead NAAQS Review: Comparison of Numbers/Percents of Sites/Counties/Populations That are Not Likely to Meet Various Potential NAAQS Levels Using Various Averaging Times and Forms
Technical memo showing comparisons of various potential naaqs levels
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Exceptional Events Documents PM2.5 - Plumas Co.
Exceptional Events Documents PM2.5 - Plumas Co.
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Analysis relating the W126 metric and the annual 4th highest daily maximum 8-hour concentration metric (Nov 20, 2014 technical memorandum)
This memo provides the results of a technical analysis which examines the relationship between the 4th max metric and the W126 metric based on ambient air quality from 2001 to 2013.
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Lead NAAQS Review: Comparison of Numbers/Percents of Sites/Counties/Populations That are Not Likely to Meet Various Potential NAAQS Levels Using Various Averaging Times and Forms
This is the memorandum documenting analyses to support the lead NAAQS review.
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Best Communication Practices for Preparation of Exceptional Event Demonstrations
OAQPS developed this document of Best Practices based on input received from EPA regional offices and selected state/local air agencies who submitted Exceptional Event Demonstrations under the 2007 version of the Exceptional Events Rule (EE Rule).
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Interim Guidance on the Preparation of Demonstrations in Support of Requests to Exclude Ambient Air Quality Data Affected by High Winds Under the Exceptional Events Rule
The purpose of this document is to provide assistance and illustration to air agencies implementing the EER for high wind dust events.
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Public Notice of Exceptional Events - Uinta Basin of Utah
This page contains an announcement of public comment for exceptional events in the Uinta Basin of Utah, along with a technical support document containing details.
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One Point Quality Control Single Point Precision and Bias Graphics For Criteria Pollutants
This document defines the elements displayed in the corresponding box and whisker graphics as
well as base assumptions of the data contained within the AQS AMP256 report. -
Endocrine Disruptor Screening Program (EDSP)
Information on endocrine disrupting chemicals and EPA's regulatory requirements
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Exceptional Events Documents PM2.5 - Montana
Exceptional Events Documents PM2.5 - Montana