# Air Plan Approval; California; San Diego County Air Pollution Control District; Oxides of Nitrogen
> **Rule** · Final rule. · Published 2023-12-21 · Effective 2024-01-22 · 88 FR 88254
## Document
- **Document number:** 2023-27876
- **Category:** air-emissions
- **Federal Register citation:** 88 FR 88254
- **CFR reference:** 40 CFR 52
- **Publication date:** 2023-12-21
- **Effective date:** 2024-01-22
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2023-0157
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the San Diego County Air Pollution Control District (SDCAPCD) portion of the California State Implementation Plan (SIP). This revision concerns emissions of oxides of nitrogen (NO<INF>X</INF>) from small boilers, process heaters, steam generators, and large water heaters. We are approving a local rule that regulates these emission sources under the Clean Air Act (CAA or "the Act").

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/12/21/2023-27876/air-plan-approval-california-san-diego-county-air-pollution-control-district-oxides-of-nitrogen)
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