# Approval and Promulgation of State Implementation Plans: Oregon; Salem Carbon Monoxide Nonattainment Area; Designation of Areas for Air Quality Planning Purposes
> **Rule** · — · Published 2009-01-12 · 74 FR 1148
## Document
- **Document number:** Z8-30825
- **Category:** air-emissions
- **Federal Register citation:** 74 FR 1148
- **CFR reference:** 40 CFR 52
- **Publication date:** 2009-01-12
- **State:** OR
- **EPA docket:** EPA-R10-OAR-2007-0915
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/01/12/Z8-30825/approval-and-promulgation-of-state-implementation-plans-oregon-salem-carbon-monoxide-nonattainment)
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