Learn the Issues
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CPRG - Transportation Sector Infographic
Climate Pollution Reduction Grants overview
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CPRG Overview and Sector Infographics
Climate Pollution Reduction Grants overview
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How are Oxides of Nitrogen (NOx) defined in the NEI?
For all source categories, NOx is compiled from emissions measurements that express NOx mass based on the molecular weight of nitrogen dioxide (NO2), which is 46. Even though emission streams initially consist mainly of NO from most sources, this expression of NOx by NO2 MW is appropriate due to the…
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Minor NSR Basic Information
Provides basic information about the minor New Source Review permitting programs
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Setting and Reviewing Standards to Control Lead (Pb) Pollution
Lead (Pb) standards are part of the National Ambient Air Quality Standards (NAAQS), which limit air pollution to protect health and the environment. Standards are periodically reviewed and updated, and air quality across the U.S. is measured against them.
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Setting and Reviewing Standards to Control Particulate Matter (PM) Pollution
The Clean Air Act requires EPA to set national air quality standards for particulate matter, and to periodically review the standards to ensure that they provide adequate health and environmental protection, updating those standards as necessary.
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Responses to Public Comments on EPA’s Standards of Performance for Municipal Solid Waste Landfills and Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills: Proposed Rules - July 2016
Responses to Public Comments on EPA’s Standards of Performance for Municipal Solid Waste Landfills and Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills: Proposed Rules - July 2016
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How EPA Works with States on SIPs
How EPA with States on SIPs
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Vehicle Certification and Compliance Testing
The National Vehicle and Fuel Emissions Laboratory (NVFEL) tests a portion of all new cars and trucks to confirm compliance with EPA’s exhaust emissions standards, and to verify the accuracy of fuel economy test results submitted by each manufacturer.
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Tribal Solid Waste and Sustainable Materials Management in Region 10
List of available tools, technical assistance, and other resources to support Tribal solid waste implementation activities in Alaska, Idaho, Oregon, and Washington (EPA's Region 10).
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Protecting Our Oceans from Pollution
EPA Headquarters and Regional Offices work together to administer the Marine Protection Permitting Program. Regional responsibilities and Regional Marine Protection Permitting Web pages are provided.
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Chinook Salmon
An assessment of Chinook salmon abundance in the Salish Sea. Part of the U.S. EPA and Environment and Climate Change Canada's Health of the Salish Sea Ecosystem Report.
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Marine Species at Risk
An assessment of marine species at risk of extinction in the Salish Sea watershed. Part of the U.S. EPA and Environment and Climate Change Canada's Health of the Salish Sea Ecosystem Report.
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Quileute Tribe Water Monitoring Program
Learn about the Quileute Tribe's water monitoring program for the Quillayute River in Washington.
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Sewersheds
Water Infrastructure and Capacity Assessment Tool
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Indicators Used in the National Aquatic Resource Surveys
National Aquatic Resource Surveys use biological, physical, chemical and recreational indicators of water quality.
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Indicators: Macrophytes
Macrophytes are aquatic plants growing in or near water. They may be either emergent (i.e., with upright portions above the water surface), submerged, or floating. Examples of macrophytes include cattails, hydrilla, water hyacinth, and duckweed.
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National Rivers and Streams Assessment 2008-2009 Report
PDF of the NRSA 2008-2009 final report
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Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2019
View or download the Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2019, including individual chapters and annexes.
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EPA Approves New WIFIA Loans to Strengthen Drinking Water and Wastewater Infrastructure in Oregon and Washington
EPA is announcing its approval of three Water Infrastructure Finance and Innovation Act (WIFIA) loans totaling $240 million to improve vital water infrastructure.