# Air Plan Revisions; California; Mojave Desert Air Quality Management District; New Source Review; Stationary Source Permits
> **Rule** · Final rule. · Published 2026-03-23 · Effective 2026-04-22 · 91 FR 13774
## Document
- **Document number:** 2026-05591
- **Category:** air-emissions
- **Federal Register citation:** 91 FR 13774
- **CFR reference:** 40 CFR 52
- **Publication date:** 2026-03-23
- **Effective date:** 2026-04-22
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2025-0625
## Abstract

The Environmental Protection Agency (EPA) is finalizing conditional approval of five permitting rules as a revision to the Mojave Desert Air Quality Management District (MDAQMD or the "District") portion of the California State Implementation Plan (SIP). These are revisions to the District's New Source Review (NSR) air permitting program rules for new and modified sources of air pollution under part D of title I of the Clean Air Act (CAA or "Act").

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/03/23/2026-05591/air-plan-revisions-california-mojave-desert-air-quality-management-district-new-source-review)
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