EPA Approves West Virginia's Ozone Pollution Tweaks
Published Date: 6/11/2025
Proposed Rule
Summary
West Virginia is updating rules to limit pollution from big industrial boilers, engines, and cement kilns during ozone season. This helps keep the air cleaner by controlling nitrogen oxide emissions. The EPA is approving these changes, which mainly affect large factories and power equipment, with no new costs expected for businesses.
Analyzed Economic Effects
4 provisions identified: 4 benefits, 0 costs, 0 mixed.
NOx Limits for Large Industrial Boilers
West Virginia's rule sets ozone‑season nitrogen oxides (NOx) limits and requirements for non‑electrical generating unit (non‑EGU) large industrial boilers and combustion turbines that have a maximum design heat input greater than 250 MMBtu/hr. The EPA is proposing to approve this state implementation plan revision under the Clean Air Act. The change is intended to control NOx during the ozone season.
NOx Requirements for Stationary Engines
West Virginia's revision establishes ozone‑season NOx limitations and requirements for affected stationary internal combustion engines. The EPA is proposing to approve this SIP revision under the Clean Air Act to control nitrogen oxide emissions during ozone season.
NOx Controls for Cement Kilns
The state rule adds ozone‑season NOx limitations and requirements for affected cement manufacturing kilns. The EPA is proposing to approve the West Virginia SIP revision under the Clean Air Act to limit nitrogen oxide emissions from those kilns during ozone season.
EPA Approval; No New Business Costs
The EPA is proposing to approve West Virginia's SIP revision that establishes ozone‑season NOx limits for the listed large sources; the agency states this action mainly affects large factories and power equipment and that no new costs are expected for businesses. The approval is being taken under the Clean Air Act.
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