# Approval and Promulgation of Air Quality Implementation Plans; Indiana; Oxides of Nitrogen Regulations
> **Rule** · Direct final rule. · Published 2003-12-11 · Effective 2004-01-26 · 68 FR 69025
## Document
- **Document number:** 03-30696
- **Category:** air-emissions
- **Federal Register citation:** 68 FR 69025
- **CFR reference:** 40 CFR 52
- **Publication date:** 2003-12-11
- **Effective date:** 2004-01-26
- **State:** IN
- **EPA docket:** IN159-1a
## Abstract

EPA is approving revisions to the oxides of nitrogen (NO<INF>X</INF>) budget trading program submitted by Indiana on June 26, 2003, and August 4, 2003. These changes revise Indiana's NO<INF>X</INF> State Implementation Plan (SIP) and NO<INF>X</INF> budget approved by EPA on November 8, 2001. The most significant change adds 17 units from three sources to the NO<INF>X</INF> trading portion of the Indiana plan. The plan revision also includes: A compliance date change to accommodate revised deadlines under the NO<INF>X</INF> SIP call; a revised definition of "energy efficiency project" to include anaerobic digestion systems; the addition of formulas to describe an energy efficiency and renewable energy "set aside"; and minor wording changes and correction of typographical errors. These changes are consistent with Indiana's previously approved "Phase I budget."

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/12/11/03-30696/approval-and-promulgation-of-air-quality-implementation-plans-indiana-oxides-of-nitrogen-regulations)
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