The Missouri Department of Natural Resources develops plans consistent with federal regulations related to National Ambient Air Quality Standards under Section 110 or Part D of the Clean Air Act. The department also develops plans to address requirements in other sections of the Clean Air Act. This page provides information on these other plans.
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Regional Haze Plan
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All states were required by the Clean Air Act to submit Regional Haze SIPs in order to address visibility in federally protected Class I areas. These SIP elements address pollutants that affect visibility and also those that cause acid rain.
Second Regional Haze Plan
The Regional Haze Rule requires states to update their Regional Haze Plans every 10 years to ensure Class I areas continue to make progress towards their visibility goals.
The department is currently developing its first major revision to its original Regional Haze SIP as required by the federal Regional Haze rule. As part of this effort, the department has identified eight in-state sources of visibility impairing pollution and sent letters requesting information needed to perform and analysis of pollution control potential at these sources. These eight letters are included below.
Second Regional Haze Plan Action Table
MoDNR Submittal Date MoDNR Action/Document EPA Date EPA Action/Document Aug. 26, 2022 State Implementation Plan Revision - Missouri Regional Haze Plan for the Second Planning Period Pending Pending First Regional Haze Plan
First Regional Haze Plan Action Table
MoDNR Submittal Date MoDNR Action/Document EPA Date EPA Action/Document July 26, 2017 Clarification Letter - First Regional Haze Plan Sept. 24, 2018 Full Approval - Regional Haze Plan
Aug. 29, 2014 First Regional Haze Plan 5-Year Progress Report Sept. 29, 2015 Approval - 5-Year Progress Report
Feb. 3, 2012 Supplement - First Regional Haze Plan June 26, 2012 Limited Approval - Regional Haze Plan
July 29, 2009 First Regional Haze Plan June 26, 2012 Limited Approval - Regional Haze Plan
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Interstate Transport SIPs
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Section 110(a)(2)(D)(i)(l) of the Clean Air Act requires states to submit SIPs demonstrating that emissions in their state do not have a significant impact on downwind states’ ability to meet or maintain the National Ambient Air Quality Standards for all criteria pollutants. Typically, ozone and particulate matter are the two criteria pollutants in which long range transport of pollutants and precursors can have a significant impact on downwind states.
Interstate Transport SIPs Action Table
MoDNR Submittal Date MoDNR Action/Document EPA Date EPA Action/Document March 7, 2019 10 CSR 10-6.372;
10 CSR 10-6.374;
10 CSR 10-6.376;
These rules can be viewed on the Missouri Secretary of State's website.Dec. 4, 2019 Approval of 10 CSR 10-6.372 and 10 CSR 10-6.376
April 26, 2005 May 8, 2007 Approval - Interstate Transport SIP
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Inspection and Maintenance SIPs
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When new or revised NAAQS are published the EPA also releases implementation requirements for those new standards that must be included in SIPs. The Inspection/Maintenance Program (I/M) is required for all moderate ozone non-attainment areas. This SIP includes the motor vehicle emission inspection requirements for vehicles registered within the St. Louis ozone non-attainment area. See Gateway Vehicle Inspection Program for more information.
Inspection and Maintenance SIPs Action Table
MoDNR Submittal Date MoDNR Action/Document EPA Date EPA Action/Document Dec. 6, 2019 Clarification Letter to Remove I/M in Franklin County N/A N/A Nov. 12, 2019 2019 St. Louis I/M SIP Revision Pending Pending
Dec. 6, 2007 2007 St. Louis I/M SIP Revision March 3, 2015 Approved - I/M SIP Revision
Oct. 1, 2003 2003 St. Louis I/M SIP Submittal Letter May 13, 2004 Approved - I/M SIP Revision
If you are looking for a document that is not available on our website, please submit a Missouri Sunshine Law request.