# Approval and Promulgation of Air Quality Implementation Plans; Charlotte, Raleigh/Durham and Winston-Salem Carbon Monoxide Limited Maintenance Plan
> **Rule** · Direct final rule. · Published 2013-02-22 · Effective 2013-04-23 · 78 FR 12238
## Document
- **Document number:** 2013-04011
- **Category:** air-emissions
- **Federal Register citation:** 78 FR 12238
- **CFR reference:** 40 CFR 52
- **Publication date:** 2013-02-22
- **Effective date:** 2013-04-23
- **EPA docket:** EPA-R04-OAR-2012-0961
## Abstract

EPA is taking direct final action to approve a limited maintenance plan update submitted by the State of North Carolina, through the North Carolina Department of Environment and Natural Resources (NC DENR), on August 2, 2012. The limited maintenance plan update is for the Charlotte, Raleigh/Durham and Winston-Salem carbon monoxide (CO) maintenance areas. Specifically, the State submitted a limited maintenance plan update for CO, showing continued attainment of the 8-hour CO National Ambient Air Quality Standard (NAAQS) for the Charlotte, Raleigh/Durham and Winston-Salem Areas. The 8-hour CO NAAQS is 9 parts per million (ppm). EPA is taking direct final action to approve the limited maintenance plan update because it is consistent with the Clean Air Act (CAA or Act), and EPA's policy for limited maintenance plans.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/02/22/2013-04011/approval-and-promulgation-of-air-quality-implementation-plans-charlotte-raleighdurham-and)
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