EPA proposed and then finalized a supplemental rulemaking to the CSAPR that includes five additional states - Iowa, Michigan, Missouri, Oklahoma, and Wisconsin - in the ozone season NO_X CSAPR program.

December 15, 2011 - Supplemental Notice of Final Rulemaking (SNFR)

EPA finalized a supplemental rule that includes five additional states - Iowa, Michigan, Missouri, Oklahoma, and Wisconsin - in the ozone season NO_X program in the Cross-State Air Pollution Rule (CSAPR). EPA has concluded that these five states plus Kansas significantly contribute to nonattainment and/or interference with maintenance of the 1997 ozone NAAQS in other states.

• Supplemental Notice of Final Rulemaking (Federal Register, 76 FR 80760)
• Fact Sheet
• Presentation - Updated December 15, 2011 to reflect the final supplemental rule for CSAPR, the proposed technical revisions rule, recent implementation activities, and other information.

Technical Support Documents

• Determination of State Budgets for the Final Ozone Supplemental of the Transport Rule TSD
• Transport Rule Supplemental Notice of Final Rulemaking TSD
  • Final Unit-Level Ozone Season NOx Allowance Allocations to Existing Units in Five States: Supplemental Final Rule TSD
  • Final Unit-Level Ozone Season NOx Allowance Allocations to Existing Units in Five States: Supplemental Final Rule TSD and Underlying Data (XLS)(2 pp, 430 K)

July 6, 2011 - Supplemental Notice of Proposed Rulemaking (SNPR)

EPA received some requests to extend the comment period for the supplemental notice of proposed rulemaking (SNPR) related to the Cross-State Air Pollution Rule. The comment period on this rule ended on August 22, 2011. The supplemental proposal and all of the key supporting documentation and model results were posted on our website on July 7, 2011 and the SNPR was formally published in the Federal Register on July 11, 2011. We believe the comment period provided was sufficient for interested parties to review the supplemental proposal, and to prepare and submit public comment that was within the scope of the issues presented for public comment in the SNPR. As such, EPA has not extended the public comment period for this rulemaking.

• SNPR Fact Sheet
• Proposed SNPR (Federal Register, 76 FR 40662)

Technical Support Documents

• Proposed Unit Level Ozone Season NO_x Allowance Allocations to Existing Units in Six States: Supplemental Proposed Rule TSD (PDF 18 pp, 590 kb)
  •  Proposed CSAPR Unit Level Allocations under the SNPR and Underlying Data (Excel)(387 K, 2011)

For annual SO₂ and NO_X allocations, tables include sources located in states covered by the CSAPR. For ozone-season allocations, tables include sources located in states covered by the final CSAPR as well as the 6 states that are included in the Supplemental Notice of Proposed Rulemaking for ozone-season NO_X emission reductions.