Approval and Promulgation of Implementation Plans; State of Missouri; Control of Nitrogen Oxide Emissions From Large Stationary Internal Combustion Engines

The Environmental Protection Agency (EPA) is taking final action to approve a State Implementation Plan (SIP) revision submitted by the State of Missouri to EPA on September 21, 2010, with a supplemental revision submitted on July 3, 2013. The purpose of the SIP revision is to incorporate revisions to a Missouri regulation to control Nitrogen Oxide (NO<INF>X</INF>) emissions from large stationary internal combustion engines. This revision includes an emission rate limitation for both large stationary diesel and dual fuel internal combustion engines and adds an exemption for compression ignited stationary internal combustion engines that emit 25 tons or less of NO<INF>X</INF> between May 1 and September 30. EPA has determined that the SIP revision submitted by the State of Missouri satisfies the applicable requirements of the Clean Air Act (CAA or Act), and in particular, the April 21, 2004, final Federal Phase II NO<INF>X</INF> SIP Call.