On June 28, 2004, Ohio submitted an oxides of nitrogen (NO<INF>X</INF>) State Implementation Plan (SIP) revision request to EPA which included amended rules in Ohio Administrative Code (OAC). The purpose of the SIP revision is to exclude from the NO<INF>X</INF> trading program carbon monoxide boilers associated with fluidized catalytic cracking units (FCCU). The revision also allocates additional NO<INF>X</INF> allowances to the overall budget and to the trading budget to correct a typographical error made in the original rule. Removal of the FCCU boilers from the NO<INF>X</INF> trading program is an option Ohio has elected to incorporate in its NO<INF>X</INF> SIP. The Ohio SIP revision addresses some minor corrections in the rules and also incorporates by reference specific elements of the NO<INF>X</INF> SIP Call. EPA is approving the Ohio request because the changes conform to EPA policy under the Clean Air Act. The collective emissions from these sources are small and the administrative burden, to the states and regulated entities, of controlling such sources is likely to be considerable. Inclusion of these small NO<INF>X</INF> sources in the NO<INF>X</INF> SIP Call control program would not be cost effective.