# Air Plan Approval; California; Mojave Desert Air Quality Management District; Oxides of Nitrogen
> **Rule** · Final rule. · Published 2025-05-19 · Effective 2025-06-18 · 90 FR 21236
## Document
- **Document number:** 2025-08875
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 21236
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-05-19
- **Effective date:** 2025-06-18
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2024-0563
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Mojave Desert Air Quality Management District (MDAQMD) portion of the California State Implementation Plan (SIP). This revision concerns emissions of oxides of nitrogen (NO<INF>X</INF>) from industrial, institutional, and commercial boilers, steam generators, and process heaters. 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/2025/05/19/2025-08875/air-plan-approval-california-mojave-desert-air-quality-management-district-oxides-of-nitrogen)
---
*AI Analytics · CC0 1.0*