Oklahoma Clears SO2 Transport Hurdle with EPA
Published Date: 2/12/2026
Proposed Rule
Summary
The EPA is proposing to approve Oklahoma’s plan showing it won’t send too much sulfur dioxide pollution to other states, keeping the air cleaner for everyone. This affects Oklahoma and its neighbors by helping meet air quality rules set back in 2010. People can share their thoughts by March 16, 2026, but no big costs or changes for businesses are expected.
Analyzed Economic Effects
3 provisions identified: 2 benefits, 0 costs, 1 mixed.
EPA Proposes Approval of Oklahoma SIP
The EPA is proposing to approve Oklahoma's State Implementation Plan (SIP) showing the State meets the Clean Air Act "good neighbor" requirements for the 2010 1-hour sulfur dioxide (SO2) standard (75 ppb). The EPA focused on larger point sources within 50 kilometers of state borders and facilities emitting over 100 tons per year (tpy) of SO2, and proposes to find Oklahoma's emissions will not significantly contribute to nonattainment or interfere with maintenance in other states.
SIP Will Apply to Most Indian Country
If finalized, the SIP approval will apply statewide in Oklahoma and will also apply to most areas of Indian country in Oklahoma as authorized under Oklahoma's SAFETEA request, except for specifically excluded Indian allotments and trust or certain fee lands. The EPA states this action will not impose substantial direct compliance costs on federally recognized Tribal governments and will not preempt Tribal law.
No New Federal Costs for Oklahoma Businesses
The EPA says this proposed approval merely accepts state law as meeting Federal requirements and does not add federal requirements beyond state law. The EPA certified this action does not have a significant economic impact on a substantial number of small entities and expects no big costs or changes for businesses.
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Key Dates
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