# Approval and Promulgation of Implementation Plans-Tennessee: Knox County Maintenance Plan Update
> **Rule** · Direct final rule. · Published 2004-02-02 · Effective 2004-04-02 · 69 FR 4852
## Document
- **Document number:** 04-1970
- **Category:** air-emissions
- **Federal Register citation:** 69 FR 4852
- **CFR reference:** 40 CFR 52
- **Publication date:** 2004-02-02
- **Effective date:** 2004-04-02
- **State:** TN
- **EPA docket:** TN-257-200402(a)
## Abstract

The EPA is approving revisions to the Tennessee State Implementation Plan (SIP) submitted by the Tennessee Department of Environment and Conservation (TDEC) on August 20, 2003. This SIP revision satisfies the requirement of the Clean Air Act as amended in 1990 (CAA) for the 10-year update of the Knox County 1-hour ozone maintenance plan.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/02/02/04-1970/approval-and-promulgation-of-implementation-plans-tennessee-knox-county-maintenance-plan-update)
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