Learn the Issues
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Acid Rain Program
View an overview of the Acid Rain Program, including information on the program's SO2 and NOx reductions.
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Sources and Solutions: Agriculture
Agriculture can contribute to nutrient pollution when fertilizer use, animal manure and soil erosion are not managed responsibly.
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CSAPR Compliance Year 2019 NUSA NODAs
This page contains links to NUSA Notices of Data Availability for the CSAPR 2019 compliance year.
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Cross-State Air Pollution Rule - Additional Actions
This page provides a regulatory time line of the CSAPR and the Final Update Rule including legal challenges and court rulings.
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Natural Disasters
Prepare for or recover after risks to health and the environment due to natural disasters.
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CSAPR Compliance Year 2020 NUSA NODAs
This page contains links to NUSA Notices of Data Availability for the CSAPR 2020 compliance year.
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CSAPR Assurance Provision NODAs
For each calendar year for which the CSAPR assurance provisions are triggered, EPA publishes a preliminary and final notice of data availability (NODA) in the federal register.
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CSAPR Compliance Year 2018 NUSA NODAs
This page contains links to NUSA Notices of Data Availability for the CSAPR 2016 compliance year.
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CSAPR Compliance Year 2023 NUSA NODAs
This page contains links to NUSA Notices of Data Availability for the CSAPR 2023 compliance year.
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Geoengineering
Geoengineering refers to activities intended to cool the Earth or remove greenhouse gases from the air and has health and environmental impacts. This area summarizes geoengineering, what EPA is doing, and frequent questions, including on contrails.
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Environmental Topics
EPA's resources on environmental issues include research, basics, what you can do, and an index covering more specific terms.
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Analysis of the Proposed Supplemental Interstate Transport Rule
IPM analyses of the Proposed Supplemental Interstate Transport Rule
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Analysis of the Final Federal Good Neighbor Plan Addressing Regional Ozone Transport for the 2015 Ozone National Ambient Air Quality Standard
IPM analyses of the Good Neighbor Plan for 2015 Ozone NAAQS.
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Frequent Questions
Find answers to frequently asked questions geared toward the general public, teachers and students, academic researchers, and regulated power plants.
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Progress Report - Air Quality
EPA’s Progress Report provides annual updates on program implementation and resulting changes in emissions.
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Summary Data
List of the major summary data, tools, and resources used by the Clean Air Markets Programs.
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Progress Report - Index of Graphics
Index of graphics for the Power Sector Programs Progress Report.
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Air Toxics Data Update
Information on improving access to air toxics data
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Programs & Progress
Learn about the progress made through EPA's Clean Air Markets Programs and find links to progress reports, emissions trends, and additional resources.
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Addition of 1-BP (nPB) to the Clean Air Act List of Hazardous Air Pollutants
Fact sheet and pre-publication version of the notice to grant petitions to add n-propyl bromide to the list of hazardous air pollutants