State Plan Actions
On Public Notice
Area Boundary Recommendation for the 2015 Ozone Standard
In 2015, the U.S. Environmental Protection Agency (EPA) strengthened the 8-hour ozone National Ambient Air Quality Standard (NAAQS) to 70 parts per billion. Missouri is submitting to EPA boundary designation recommendations for this revised standard in accordance with the Clean Air Act and following EPA’s Area Designations Memorandum (February 25, 2016). Nonattainment recommendations are for areas with monitored violations based on 2013 to 2015 data and areas contributing to the violations. All other areas of the state are recommended for an attainment/unclassifiable designation. The air program intends to submit this recommendation to EPA by October 2016, and EPA will designate areas by October 2017. This action will not be submitted for inclusion in the Missouri State Implementation Plan.
A public hearing is scheduled for this boundary recommendation on August 25, 2016. Comments about this plan action will be accepted through close of business on September 1, 2016.
Proposed for Adoption
Missouri State Implementation Plan Revision - Redesignation Request and Maintenance Plan for the St. Louis (MO) 2008 Ozone Standard Nonattainment Area
This SIP revision addresses redesignation requirements, per the Clean Air Act, for the St. Louis (MO) nonattainment area under the 2008 ozone standard. The St. Louis (MO) area counties of Franklin, Jefferson, St. Louis, and St. Charles as well as the city of St. Louis were designated nonattainment by the U.S. Environmental Protection Agency (EPA) on May 21, 2012, and monitoring data for 2013 to 2015 show the area has attained the standard of 75 parts per billion. The SIP revision includes a maintenance plan to demonstrate the St.Louis (MO) area will continue to meet the standard in future years as outlined in emission inventory projections, contingency measures, and motor vehicle budgets. Redesignation to attainment will occur when EPA gives final approval of this plan.
A public hearing was held for this plan action on July 28, 2016. Comments about this plan action were accepted through close of business on August 4, 2016. This plan is scheduled for adoption on August 25, 2016.