On this page:

• Rule Summary
• Rule History
• Additional Resources

Rule Summary

On November 16, 2015, the EPA proposed an update to the Cross-State Air Pollution Rule (CSAPR) for the 2008 ozone National Ambient Air Quality Standards (NAAQS) by issuing the proposed CSAPR Update Rule. 

EPA held a public hearing on December 17, 2015 and the public comment period for the proposal ended on February 1, 2016.

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Rule History

November 16, 2015 - Proposed Cross-State Air Pollution Update Rule

The EPA proposed Federal Implementation Plans (FIPs) in the CSAPR Update Rule to address air quality impacts of the interstate transport of ozone air pollution in the eastern United States.

• Proposed Cross-State Air Pollution Update Rule
• Regulatory Impact Analysis

• Technical support documents
  • Air Quality Modeling TSD for the 2008 Ozone NAAQS Cross-State Air Pollution Rule Proposal. (The data files posted below pertain to this proposal and were also released as part of the July 23, 2015 Notice of Data Availability)
    • Updated 8-Hour Ozone Model Performance Statistics by Monitoring Site for the 2011 Base Year CAMx Model Simulation (XLS)(2 pp, 300 K)
    • Data File with 2017 Ozone Contributions (XLS)(2 pp, 338 K)
    • Data File with Ozone Design Values (XLS)(2 pp, 65 K)
  • EGU NO_X Mitigation Strategies Proposed Rule TSD
  • Ozone Transport Policy Analysis TSD, and Appendix E - Detailed Budget Calculations
  • Status of 110(a)(2)(D)(i)(I) SIPs Proposed Rule TSD
  • Assessment of Non-EGU NO_X Emission Controls, Cost of Controls, and Time for Compliance TSD
  • Unit Level Allocations and Underlying Data for the CSAPR for the 2008 Ozone NAAQS(3 pp, 2 MB)

• Power Sector Modeling
• Fact Sheet

Previous Actions:

• July 23, 2015 - Notice of Data Availability

• January 2015 - Memo and Information Sharing

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Additional Resources

• Cross-State Air Pollution Rule
• Interstate Air Pollution Transport

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