# Approval and Promulgation of Air Quality Implementation Plans; Indiana; Maintenance Plan Update for Lake County, Indiana for Sulfur Dioxide
> **Rule** · Direct final rule. · Published 2013-09-03 · Effective 2013-11-04 · 78 FR 54173
## Document
- **Document number:** 2013-21274
- **Category:** air-emissions
- **Federal Register citation:** 78 FR 54173
- **CFR reference:** 40 CFR 52
- **Publication date:** 2013-09-03
- **Effective date:** 2013-11-04
- **State:** IN
- **EPA docket:** EPA-R05-OAR-2013-0377
## Abstract

EPA is approving a maintenance plan update for the Lake County, Indiana sulfur dioxide (SO<INF>2</INF>) maintenance area. This plan update demonstrates that Lake County will maintain attainment of the 1971 SO<INF>2</INF> national ambient air quality standard (NAAQS) through 2025. This maintenance plan update satisfies section 175A of the Clean Air Act (Act), and is consistent with the September 26, 2005, approval of the State's redesignation request and maintenance plan for the Lake County, Indiana SO<INF>2</INF> area.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/09/03/2013-21274/approval-and-promulgation-of-air-quality-implementation-plans-indiana-maintenance-plan-update-for)
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