Federal Register #2026-20096

EPA approval of Missouri NOX emissions rule revisions for large stationary engines

The U.S. Environmental Protection Agency (EPA), Region 7, is taking regulatory action on Missouri’s emissions rules for large stationary engines. - Government buyer and agency: U.S. Environmental Protection Agency (EPA), Region 7; the action concerns Missouri’s State Implementation Plan. - Rule involved: Missouri rule 10 CSR 10-6.390, Control of NOX Emissions From Large Stationary Internal Combustion Engines. - Revisions address reporting, recordkeeping, and compliance requirements; incorporate other state rules by reference; add definitions; revise restrictive or duplicative wording; and make administrative updates. - The revisions also create an exemption for certain spark-ignited internal combustion engines. - This is a regulatory action, not a procurement. No OEMs, vendors, products, services, quantities, or part numbers are identified.

Description

The Environmental Protection Agency is approving revisions to the Missouri State Implementation Plan concerning control of nitrogen oxide (NOX) emissions from large stationary internal combustion engines. The revisions update reporting, recordkeeping, and compliance requirements; incorporate other state rules by reference; add rule-specific definitions; revise restrictive or duplicative language; and make administrative wording changes. They also add an exemption for certain spark-ignited internal combustion engines. The final approval takes effect November 2, 2026, under the Clean Air Act.

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