# 2025-15989: California Air Plans Get a Format Facelift

2025-15989, Air Plan Approval; California; Revised Format for Materials Incorporated by Reference, is a Federal Register rule from Environmental Protection Agency published 2025-08-21 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2025-15989
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2025-15989
- Title: Air Plan Approval; California; Revised Format for Materials Incorporated by Reference
- Type: Rule
- Agencies: Environmental Protection Agency
- Citation: 90 FR 40896
- Published: 2025-08-21
- Effective: unknown
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-06-11

## In one line

California Air Plans Get a Format Facelift

## Summary

The EPA is updating how California’s air quality rules are organized and shared, making them easier to find and read. This change affects certain local and regional air rules already approved, with no new costs or deadlines. It’s part of a bigger plan to refresh the whole California air quality rulebook.

## Abstract

The Environmental Protection Agency (EPA) is revising the format for materials submitted by the State of California that are incorporated by reference into the California State Implementation Plan (SIP). The regulations and other materials affected by this format change have all been previously submitted by the State of California and approved by the EPA. This format revision will primarily affect the "Identification of plan--in part" sections, as well as the format of the SIP materials that will be available for public inspection at the EPA Regional Office and the National Archives and Records Administration (NARA). This action, which only relates to source- specific requirements and certain local and regional California air district rules, is the fourth of a series of actions intended to change the format for the entire California SIP.

## Effects PRIA read

No economic effects identified for this document.

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## Sources
- [2025-15989 on federalregister.gov](https://www.federalregister.gov/documents/2025/08/21/2025-15989/air-plan-approval-california-revised-format-for-materials-incorporated-by-reference)
- [2025-15989 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-08-21/pdf/2025-15989.pdf)

## Related
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- [Next: 2025-15990, Determination of Attainment by the Attainment Date; 2008 8-Hour Ozone Standards…](https://policyrisk.com/federal-register/2025-15990)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2025-15989 (as of 2026-06-11).