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The Missouri Department of Natural Resources filed the following proposed rulemakings with the Missouri Secretary of State's office. To submit comments electronically, follow the links listed. To submit written comments, see the address below.

On Public Notice

The department's Air Pollution Control Program has three proposed amendments on public notice through Feb. 7, 2017. For more information, visit the department's Regulatory Action Tracking System at, which gives links to published material in the Missouri Register and offers an electronic method for submitting comments. This page also provides additional background information in the Rules in Development section.

Proposed for Adoption

Nothing at this time

Recently Adopted

10 CSR 10-6.210 Confidential Information
This amendment will clarify the procedures for submitting and handling confidential business information, clarify requirements for granting a claim of confidentiality, clarify which emission data elements will be held confidential, reorganize the rule into the standard rule organization format, and remove the definitions currently listed in section (3) of the rule since they can be found in 10 CSR 10-6.020 Definitions and Common Reference Tables.

Proposed Rulemaking - published in June 1, 2016 Missouri Register

Additional Information

Comments on this rulemaking were accepted through close of business, Aug. 4, 2016.

10 CSR 10-6.220 Restriction of Emission of Visible Air Contaminants
This amendment will remove a statement from the compliance and performance testing provisions that does not meet Clean Air Act requirements.  This statement could be interpreted as allowing for exemptions from federally enforceable emission limits through the state director’s discretion.  This action was initiated by a petition received by the U.S. Environmental Protection Agency (EPA) concerning the treatment of excess emissions by sources during startup, shutdown, or malfunction conditions.  EPA responded to the petition by finalizing a State Implementation Plan (SIP) Call that requires us to fix this deficiency in the rule.  At the same time, the following exemptions are being added to reduce regulatory burden and eliminate duplicative requirements:

    • power plants complying with Mercury and Air Toxics Standards (MATS)
    • certain sources subject to the federal boiler Maximum Achievable Control Technology (MACT) regulations
    • fugitive emissions subject to 10 CSR 10-6.170, and
    • units designed to burn certain gaseous fuels such as natural gas.

Additional clarification and maintenance changes are also being incorporated into this rulemaking.

Proposed Rulemaking - published in May 2, 2016 Missouri Register

Additional Information

Technical support document

Comments on this rulemaking were accepted through close of business, Aug. 4, 2016.

Submit written comments about any rule development to:

Chief, Air Quality Planning Section
Missouri Department of Natural Resources
Air Pollution Control Program
P.O. Box 176
Jefferson City, MO 65102-0176