State Plan Actions
On Public Notice
None at this time
Proposed for Adoption
Missouri State Implementation Plan Revision – Redesignation Request & Maintenance Plan for the 2010 Sulfur Dioxide Standard
This SIP revision addresses redesignation requirements for the Jefferson County nonattainment area under the 2010 1-hour sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS), per the Clean Air Act. A portion of Jefferson County was designated nonattainment in August 2013. However, monitoring data for 2013-2015 show the area has attained the standard of 75 parts per billion. The SIP revision includes a maintenance plan to demonstrate Jefferson County will continue to meet the standard in future years through permanent and enforceable emissions reductions. Redesignation to attainment will occur when U. S. Environmental Protection Agency gives final approval of this plan.
A public hearing was held for this plan action on August 31, 2017. Comments about this plan action were accepted through close of business on September 7, 2017.
- Ameren Missouri
- Environmental Protection Agency Region VII
- Holcim – Sainte Genevieve Plant
- Regulatory Environmental Group for Missouri (REGFORM)
- Interdisciplinary Environmental Clinic, Washington University School of Law
Due to comments received, the plan is being reviewed for possible revisions. The plan and response to comments will be posted on this webpage in advance of the adoption meeting. Consideration for adoption is currently scheduled for the October 26, 2017, Missouri Air Conservation Commission meeting.