# Air Plan Approval and Air Quality Designation; TN; Redesignation of the Knoxville 2006 24-hour PM2.5 Nonattainment Area to Attainment
> **Rule** · Final rule. · Published 2017-08-28 · Effective 2017-09-27 · 82 FR 40718
## Document
- **Document number:** 2017-18088
- **Category:** air-emissions
- **Federal Register citation:** 82 FR 40718
- **CFR reference:** 40 CFR 52
- **Publication date:** 2017-08-28
- **Effective date:** 2017-09-27
- **EPA docket:** EPA-R04-OAR-2017-0086
## Abstract

On December 20, 2016, Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), submitted a request for the Environmental Protection Agency (EPA) to redesignate the Knoxville-Sevierville-La Follette, TN fine particulate matter (PM<INF>2.5</INF>) nonattainment area (hereinafter referred to as the "Knoxville Area" or "Area") to attainment for the 2006 24-hour PM<INF>2.5</INF> national ambient air quality standards (NAAQS) and to approve a state implementation plan (SIP) revision containing a maintenance plan and a reasonably available control measures (RACM) determination for the Area. EPA is approving Tennessee's RACM determination for the Knoxville Area and incorporating it into the SIP; approving Tennessee's plan for maintaining the 2006 24-hour PM<INF>2.5</INF> NAAQS for the Knoxville Area (maintenance plan), including the associated motor vehicle emission budgets (MVEBs) for nitrogen oxides (NO<INF>X</INF>) and direct PM<INF>2.5</INF> for the years 2014 and 2028, and incorporating it into the SIP; and redesignating the Knoxville Area to attainment for the 2006 24-hour PM<INF>2.5</INF> NAAQS.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/08/28/2017-18088/air-plan-approval-and-air-quality-designation-tn-redesignation-of-the-knoxville-2006-24-hour-pm25)
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