An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Clean Air Markets

Proposed CSAPR Close-Out

Rule Summary

Determination Regarding Good Neighbor Obligations for the 2008 Ozone National Ambient Air Quality Standard

EPA is proposing to determine that the CSAPR Update Rule fully addresses the 20 covered states’ interstate pollution transport obligations for the 2008 national ambient air quality standards (NAAQS) for ground-level ozone. The proposal uses the latest data and modeling to assess air quality nonattainment and maintenance for the 2008 ozone NAAQS. This analysis projects that, by 2023, there will be no remaining nonattainment or maintenance areas for the 2008 Ozone NAAQS in the CSAPR Update region (which encompasses most of the eastern United States). Therefore, EPA would have no obligation to establish additional requirements for sources in these states to further reduce transported ozone pollution to meet the 2008 ozone NAAQS.  In addition, the 20 covered states would not need to submit state implementation plans (SIPs) that would establish additional requirements beyond the CSAPR Update. The proposal would apply to states currently subject to CSAPR Update FIPs, as well as any state for which EPA has approved replacement of a CSAPR Update FIP with a CSAPR Update state implementation plan (SIP).

EPA held a public hearing on the proposed rule on August 1, 2018  in Washington, DC. The hearing provided interested parties the opportunity to present perspectives concerning the proposed action.

Rule History

June 29, 2018 - Proposed Cross-State Air Pollution Rule Close-Out

EPA is proposing that the CSAPR Update Rule fully addresses certain states’ interstate pollution transport obligations for the 2008 ozone NAAQS. 

Technical Support Documents (TSDs)

Previous Actions

Additional Resources