# Clean Data Determination and Approval of Base Year Emissions Inventory; California; Los Angeles-South Coast Air Basin; 189(d) Plan for the 2006 24-Hour PM2.5 NAAQS
> **Rule** · Final rule. · Published 2025-06-03 · Effective 2025-07-03 · 90 FR 23443
## Document
- **Document number:** 2025-09997
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 23443
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-06-03
- **Effective date:** 2025-07-03
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2024-0472
## Abstract

The Environmental Protection Agency (EPA) is making a clean data determination (CDD) for the Los Angeles-South Coast Air Basin ("South Coast") air quality planning area in California based on our determination that the area is attaining the 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS). As a result of this CDD, certain Clean Air Act (CAA) requirements that have applied to California will be suspended for so long as the area continues to meet the 2006 24-hour PM<INF>2.5</INF> NAAQS. The EPA is also approving a revision to California's state implementation plan (SIP) consisting of the 2018 base year emissions inventory for the South Coast PM<INF>2.5</INF> nonattainment area, submitted by the California Air Resources Board (CARB) on December 29, 2020.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/06/03/2025-09997/clean-data-determination-and-approval-of-base-year-emissions-inventory-california-los-angeles-south)
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