# Air Plan Approval; California; Sacramento Metropolitan Air Quality Management District
> **Rule** · Final rule. · Published 2021-07-13 · Effective 2021-08-12 · 86 FR 36665
## Document
- **Document number:** 2021-14526
- **Category:** air-emissions
- **Federal Register citation:** 86 FR 36665
- **CFR reference:** 40 CFR 52
- **Publication date:** 2021-07-13
- **Effective date:** 2021-08-12
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2020-0414
## Abstract

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Sacramento Metropolitan Air Quality Management District (SMAQMD) portion of the California State Implementation Plan (SIP). This revision concerns emissions of oxides of nitrogen (NO<INF>X</INF>) from water heaters, boilers, and process 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/2021/07/13/2021-14526/air-plan-approval-california-sacramento-metropolitan-air-quality-management-district)
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