# Approval and Promulgation of State Implementation Plan; Indiana
> **Rule** · Direct final rule. · Published 1997-06-26 · Effective 1997-08-25 · 62 FR 34406
## Document
- **Document number:** 97-16739
- **Category:** air-emissions
- **Federal Register citation:** 62 FR 34406
- **CFR reference:** 40 CFR 52
- **Publication date:** 1997-06-26
- **Effective date:** 1997-08-25
- **State:** IN
- **EPA docket:** IN79-1A
## Abstract

The United States Environmental Protection Agency (USEPA) is approving a February 5, 1997, request from Indiana, for a State Implementation Plan (SIP) revision for the Vanderburgh County ozone nonattainment area. The revision is for a transportation control measure (TCM) to reduce the emissions of volatile organic compounds (VOCs) from motor vehicles by converting city-owned vehicles to compressed natural gas as a fuel. Reductions in VOCs help protect the public's health and welfare by reducing ground level ozone, commonly known as urban smog. High concentrations of ground level ozone can aggravate asthma, cause inflammation of lung tissue, decrease lung function, and impair the body's defenses against respiratory infection.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/06/26/97-16739/approval-and-promulgation-of-state-implementation-plan-indiana)
---
*AI Analytics · CC0 1.0*