Air Plan Disapproval; Missouri; Control of Sulfur Dioxide Emissions
The Environmental Protection Agency (EPA) is proposing to disapprove revisions to the Missouri State Implementation Plan (SIP) submitted by Missouri on March 7, 2019. In its submission, Missouri requested rescinding a regulation addressing sulfur compounds from the SIP and replacing it with a new regulation that establishes requirements for units emitting sulfur dioxide (SO<INF>2</INF>). The EPA is proposing to disapprove the SIP revision because the state has not demonstrated that the removal of SO<INF>2</INF> emission limits for the Evergy-Hawthorn (Hawthorn, formerly Kansas City Power & Light-Hawthorn) and Ameren Labadie (Labadie) power plants from the SIP would not interfere with National Ambient Air Quality Standard (NAAQS) attainment and reasonable further progress (RFP), or any other applicable requirement of the Clean Air Act (CAA) as required under CAA section 110(l). This disapproval action is being taken under the CAA to maintain the stringency of the SIP and preserve air quality.