Air Plan Approval; Missouri; Revisions to Cross-State Air Pollution Rule Annual Trading Program and Rescission of Clean Air Interstate Rule

The Environmental Protection Agency (EPA) is taking final action to approve a State Implementation Plan (SIP) revision submitted on January 15, 2019, and two revisions submitted on March 7, 2019, by the State of Missouri. The January 15, 2019, revision requests EPA remove from the Missouri SIP the regulations that established state trading programs under the Clean Air Interstate Rule (CAIR). The EPA is only finalizing the removal of the CAIR annual nitrogen oxides (NO<INF>X</INF>) and sulfur dioxide (SO<INF>2</INF>) trading program rules. The EPA will act on the revisions to the State's CAIR seasonal NO<INF>X</INF> trading program in a separate action. The March 7, 2019, submissions request EPA approve into the SIP Missouri's Cross-State Air Pollution Rule (CSAPR) state trading program rules for SO<INF>2</INF>, annual NO<INF>X</INF>, and ozone season NO<INF>X</INF>. This approval automatically terminates Missouri EGUs' requirements to participate in the corresponding CSAPR Federal trading programs. Like the Federal trading programs being replaced, the state trading programs approved in this SIP revision fully satisfy Missouri's good neighbor obligations with respect to the 1997 and 2006 fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS) and the 1997 ozone NAAQS and at least partially satisfy the State's good neighbor obligations with respect to the 2008 ozone NAAQS. This revision will not have an adverse effect on air quality. The EPA's approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA) and the regulations governing approval of CSAPR SIPs.