# Approval and Promulgation of Implementations Plans; California Air Resources Board-In-Use Heavy-Duty Diesel-Fueled Truck and Bus Regulation, and Drayage Truck Regulation
> **Rule** · Final rule. · Published 2012-04-04 · Effective 2012-05-04 · 77 FR 20308
## Document
- **Document number:** 2012-7023
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 20308
- **CFR reference:** 40 CFR 52
- **Publication date:** 2012-04-04
- **Effective date:** 2012-05-04
- **State:** CA
- **EPA docket:** EPA-R09-OAR-2011-0544
## Abstract

EPA is taking final action to approve a revision to the California State Implementation Plan (SIP) submitted by the California Air Resources Board (CARB or Board). This revision concerns two regulations that reduce emissions of diesel particulate matter (PM), oxides of nitrogen (NO<INF>X</INF>), and other pollutants from in-use, heavy-duty diesel-fueled trucks and buses, and drayage trucks. EPA is approving this SIP revision because the Agency has determined that the regulations are consistent with the relevant Clean Air Act requirements, policies and guidance. Final approval of the two regulations and incorporation of them into the California SIP makes them federally enforceable.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/04/04/2012-7023/approval-and-promulgation-of-implementations-plans-california-air-resources-board-in-use-heavy-duty)
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