Approval and Promulgation of Implementation Plans; State of Missouri

EPA is taking direct final action to approve Missouri's request to revise the State Implementation Plan (SIP) to include the State's recently revised ozone season NO<INF>X</INF> cap and trade rules for electric generating units (EGUs) and non-electric generating units (Non-EGUs) submitted on May 18, 2007. Two existing rules were revised by the State to allow for the transition into the State's recently adopted ozone season trading rule to meet the requirements of the Clean Air Interstate Rule (CAIR). The ozone season rules, an interstate cap and trade rule for EGUs and Non-EGUs in the eastern one- third of the State and a statewide intrastate trading rule for EGUs, were revised to include language that will rescind their requirements in the year 2009, the year CAIR compliance begins. The CAIR ozone season trading rule is more restrictive than the aforementioned rules, and this action is needed to avoid imposing duplicative requirements for the affected sources in the year 2009 and thereafter.