# Final Rule; Ohio; Revised Oxides of Nitrogen (NOX) Regulation, Phase II, and Revised NOX Trading Rule
> **Rule** · Direct final rule. · Published 2008-02-04 · Effective 2008-04-04 · 73 FR 6427
## Document
- **Document number:** E8-1797
- **Category:** air-emissions
- **Federal Register citation:** 73 FR 6427
- **CFR reference:** 40 CFR 52
- **Publication date:** 2008-02-04
- **Effective date:** 2008-04-04
- **State:** OH
- **EPA docket:** EPA-R05-OAR-2007-1085
## Abstract

EPA is approving a revision to the Ohio oxides of nitrogen (NO<INF>X</INF>) State Implementation Plan (SIP) containing provisions which control emissions of NO<INF>X</INF> from large internal combustion (IC) engines, makes corrections to typographical errors in the previously approved Phase I NO<INF>X</INF> SIP, and expands the definition of NO<INF>X</INF> budget unit. This approval requires reductions in NO<INF>X</INF> emissions from large IC engines, based on cost-effective control measures. Large IC engines are defined in the State rule as emitting one ton or more of NO<INF>X</INF> per day during the ozone season. The Ohio NO<INF>X</INF> SIP Call IC engine inventory is based on the inventory of IC engines compiled by EPA as part of the NO<INF>X</INF> SIP Call rule. Including these engines in the Ohio plan reduces NO<INF>X</INF> to a level at which the State will meet its ozone season NO<INF>X</INF> budget. EPA is approving the State's revision because it satisfies the Federal requirements for Phase II sources and demonstrates that these rules will meet the Phase II budget for Ohio.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/02/04/E8-1797/final-rule-ohio-revised-oxides-of-nitrogen-nox-regulation-phase-ii-and-revised-nox-trading-rule)
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