# Air Plan Revisions; California; Mojave Desert Air Quality Management District; Oxides of Nitrogen
> **Rule** · Final rule. · Published 2023-06-16 · Effective 2023-07-17 · 88 FR 39366
## Document
- **Document number:** 2023-12632
- **Category:** air-emissions
- **Federal Register citation:** 88 FR 39366
- **CFR reference:** 40 CFR 52
- **Publication date:** 2023-06-16
- **Effective date:** 2023-07-17
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2023-0087
## Abstract

The Environmental Protection Agency (EPA) is finalizing a limited approval and limited disapproval 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 finalizing a limited approval of a local rule that regulates these emission sources under the authority of the Clean Air Act (CAA or the Act), because the rule would strengthen the current SIP-approved version of MDAQMD's rule for boilers and process heaters. We are finalizing a limited disapproval of this revision because it is inconsistent with the EPA's startup, shutdown, and malfunction (SSM) policy and Credible Evidence Rules.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/06/16/2023-12632/air-plan-revisions-california-mojave-desert-air-quality-management-district-oxides-of-nitrogen)
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