Missouri Ditches Obsolete Pollution Rules with EPA Nod
Published Date: 8/14/2025
Rule
Summary
The EPA just gave the green light to Missouri’s plan to officially remove two old rules about nitrogen oxide pollution from power plants. These rules were already phased out, so this cleanup won’t hurt air quality or cost anyone extra. This update mainly affects power plants in Missouri and makes the state’s pollution rules clearer and simpler.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
Missouri removes two obsolete NOx rules
The EPA approved Missouri’s November 14, 2018 request to remove two state rules about nitrogen oxide (NOx) emissions from the State Implementation Plan (SIP). One rule had applied to electricity generating units (EGUs) and some non-EGUs in part of Missouri and the other had applied to EGUs statewide. The change cleans up the SIP by removing rules that were already sunsetted and makes the state’s pollution rules clearer and simpler for affected power plants in Missouri.
No change to air quality or consumer costs
The EPA found that removing the two sunsetted NOx rules from Missouri’s SIP will not have an adverse effect on air quality and will not cost anyone extra. The approval follows an earlier SIP revision that already included provisions to sunset those rules, so public air quality and consumer expenses are expected to remain the same.
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