West Virginia Tightens NOx Rules for Cleaner Ozone Seasons
Published Date: 10/2/2025
Rule
Summary
West Virginia is updating its rules to better control pollution from big industrial boilers, turbines, engines, and cement kilns during ozone season. This change helps keep the air cleaner by limiting nitrogen oxide emissions from these sources. The new rules kick in soon and won’t cost businesses extra money but will protect our air and health.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
NOx Ozone-Season Limits for Big Boilers
If you operate large industrial boilers or combustion turbines in West Virginia with a maximum design heat input greater than 250 MMBtu/hr, the State's approved rule adds ozone-season limits and requirements for nitrogen oxide (NOx) emissions that will apply to your equipment. The rule also applies to affected stationary internal combustion engines and cement manufacturing kilns and was approved by the EPA under the Clean Air Act.
Cleaner Air and Health Protection in WV
The approved West Virginia rule limits nitrogen oxide (NOx) emissions from certain large industrial sources during ozone season, which the document says will help keep the air cleaner and protect health for people in West Virginia. The rule covers large non-electric generating boilers and turbines (>250 MMBtu/hr), affected stationary internal combustion engines, and cement kilns.
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