Data / Federal rules / 2025-18067
Air Plan Approval; Guam; Clean Data Determination for the Piti-Cabras Nonattainment Area for the 2010 1-Hour Sulfur Dioxide National Ambient Air Quality Standard
The Environmental Protection Agency published this final rule in the Federal Register on September 18, 2025. It took effect on October 20, 2025.
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What the agency says
The Environmental Protection Agency (EPA) is taking final action on a clean data determination (CDD) for the Piti-Cabras, Guam sulfur dioxide (SO<INF>2</INF>) nonattainment area ("Piti-Cabras area") based on our determination that the area has attained the 2010 1-hour SO<INF>2</INF> National Ambient Air Quality Standard (NAAQS, "standard," or "2010 SO<INF>2</INF> NAAQS"). In designated nonattainment areas where air quality data demonstrate that a NAAQS has been attained, the EPA interprets certain requirements of the Clean Air Act (CAA) as no longer applicable for so long as air quality continues to meet the standard. Under this Clean Data Policy, the EPA may issue a determination of attainment, known as a CDD, that a nonattainment area is attaining the relevant NAAQS. This CDD suspends the obligation to submit certain attainment planning requirements for the Piti-Cabras area for as long as the area continues to attain the 2010 SO<INF>2</INF> NAAQS or until the area is formally redesignated. This CDD does not constitute redesignation of the area to attainment. This action is being taken under the CAA.
Key facts
- Document number
- 2025-18067
- Type
- Final rule
- Action
- Final rule
- Agency
- Environmental Protection Agency
- Published
- September 18, 2025
- Takes effect
- October 20, 2025
- Dates
- This rule is effective October 20, 2025.
- Docket
- EPA-R09-OAR-2025-0137; FRL-12752-02-R9
- Code of Federal Regulations
- 40 CFR 52
- Topics
- Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Reporting and recordkeeping requirements; Sulfur oxides
- Pages
- 3
Other documents from the Environmental Protection Agency
Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on environmental protection · Rules on incorporation by reference · Published in September 2025
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