# Air Plan Approval; California; Eastern Kern Air Pollution Control District; Portland Cement Kilns
> **Rule** · Final rule. · Published 2026-04-16 · Effective 2026-05-18 · 91 FR 20363
## Document
- **Document number:** 2026-07398
- **Category:** air-emissions
- **Federal Register citation:** 91 FR 20363
- **CFR reference:** 40 CFR 52
- **Publication date:** 2026-04-16
- **Effective date:** 2026-05-18
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2025-0058
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Eastern Kern Air Pollution Control District (EKAPCD or "District") portion of the California State Implementation Plan (SIP). This revision concerns emissions of oxides of nitrogen (NO<INF>X</INF>) from Portland cement kilns. We are approving a local rule that regulates these emission sources under the Clean Air Act (CAA or "Act").

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/04/16/2026-07398/air-plan-approval-california-eastern-kern-air-pollution-control-district-portland-cement-kilns)
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