Approval and Promulgation of Air Quality Implementation Plans; Indiana; Oxides of Nitrogen Regulations

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EPA is approving revisions to the oxides of nitrogen (NO X ) budget trading program submitted by Indiana on June 26, 2003, and August 4, 2003. These changes revise Indiana's NO X State Implementation Plan (SIP) and NO X budget approved by EPA on November 8, 2001. The most significant change adds 17 units from three sources to the NO X trading portion of the Indiana plan. The plan revision also includes: A compliance date change to accommodate revised deadlines under the NO X 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."