Laws & Regulations
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Historical Regulations Impacting Cross-State Air Pollution
On this page find a list of rulemakings relevant to interstate air pollution transport.
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Proposed Cross-State Air Pollution Update Rule
Learn about the the Cross-State Air Pollution Rule (CSAPR) for the 2008 Ozone NAAQS which addresses interstate air pollution transport in 23 eastern states under the Clean Air Act.
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What Does the Clean Air Act Say about Cross-State Air Pollution?
Learn about the sections of the Clean Air Act that address Cross-State Air Pollution.
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Memo: Supplemental Information on Interstate Transport SIPs for the 2008 Ozone NAAQS
This memo provides supplemental information to states and EPA Regional offices as they develop or review SIPs that address section 11 O(a)(2)(D)(i)(I) of the CAA, as it pertains to the 2008 NAAQS.
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Interconnected Nature of Cross-State Air Pollution
Map of facilities showing regional ozone transport and the upwind-downwind linkages for ozone.
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Findings of Failure to Submit a Clean Air Act Section 110 State Implementation Plan for Interstate Transport for the 2015 Ozone National Ambient Air Quality Standards (NAAQS)
EPA is finding that seven states failed to submit complete interstate transport State Implementation Plans or SIPs for the 2015 8-hour ozone National Ambient Air Quality Standards
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Rescission of the Finding of Failure to Submit a Clean Air Act Section 110 State Implementation Plan for Interstate Transport for the 2015 Ozone National Ambient Air Quality Standards (NAAQS)
EPA is finding that seven states failed to submit complete interstate transport State Implementation Plans or SIPs for the 2015 8-hour ozone National Ambient Air Quality Standards
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March 2018 Memo and Supplemental Information Regarding Interstate Transport SIPs for the 2015 Ozone NAAQS
Projected air quality modeling results for ozone in 2023: States can use these data to develop their implementation plans.
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Section 184(c) Supplemental Notice
Notice of Public Hearing and Supplemental Information regarding the Ozone Transport Commission (OTC) Recommendation that EPA Require Daily Limits for Emissions of Nitrogen Oxides from Certain Sources in Pennsylvania.
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Final Disapproval of “Good Neighbor” State Implementation Plans Addressing Interstate Transport Obligations for the 2015 Ozone National Ambient Air Quality Standards
Final Disapproval of “Good Neighbor” State Implementation Plans Addressing Interstate Transport Obligations the 2015 Ozone National Ambient Air Quality Standards
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Memo and Supplemental Information Regarding Interstate Transport SIPs for the 2015 Ozone NAAQS
Projected air quality modeling results for ozone in 2023: States can use these data to develop their implementation plans.
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Ozone Transport Commission (OTC) Clean Air Act Section 184(c) Recommendation
This page includes information about OTC's 184(c) petition to EPA.
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Cross-State Air Pollution Rule - Supplemental Rules
Supplemental rules to the Cross-State Air Pollution Rule
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Date Change Affirmation Rules for the Cross-State Air Pollution Rule (CSAPR)
Rulemaking to Affirm Interim Amendments to Dates in Federal Implementation Plans Addressing Interstate Transport of Ozone and Fine Particulate Matter
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EME Homer City Vs. EPA - Court Opinion
Opinion issued July 28, 2015 by the U.S. Court of Appeals for the D.C. Circuit on the remaining issues raised with respect to the Cross-State Air Pollution Rule
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Environmental Protection in Indian Country
EPA's efforts to protect human health and the environment of federally recognized Indian tribes by supporting implementation of federal environmental laws consistent with the federal trust responsibility, and the government-to-government relationship.
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EPA Response to RFC 23001- N-Methylpyrrolidone (NMP)
This page contains the Agency's response to RFC 23001- Information on the Toxic Substances Control Act (TSCA) Risk Evaluation for N-Methylpyrrolidone (NMP)
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EPA Response to RFR 21001A Greenhouse Effect
EPA Response to RFC 21001A concerning Greenhouse Effect
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Title V Operating Permit Public Petition Deadlines in Region 8
The report linked below lists Proposed Title V Operating Permits submitted to Region 8 and undergoing EPA's 45-day Review, including the start and end dates for EPA's 45-day review period and the start and end dates for the public's 60-day petition period.
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LaPlace, Louisiana - Information Requests for Compliance and Emissions Inventory Requirements
Documents related to EPA's information collection request related to compliance at the former DuPont Pontchartrain Works and current Denka Performance Elastomer facility