Air Plan Approval; Oklahoma; Interstate Transport Requirements for the 2010 SO2 NAAQS
What happened
The U.S. Environmental Protection Agency (EPA) approved portions of Oklahoma's State Implementation Plan (SIP) submittal, effective November 9, 2026. This approval confirms that Oklahoma's plan satisfies the Clean Air Act's interstate transport requirements for the 2010 1-hour sulfur dioxide (SO₂) National Ambient Air Quality Standard (NAAQS). This action was signed by Donald Trump and means Oklahoma's plan prevents its air pollution from significantly contributing to nonattainment or interfering with maintenance of air quality standards in other states.
Why it matters
This policy ensures that air pollution originating in Oklahoma is controlled, so it doesn't worsen air quality in neighboring states. By upholding these requirements, it helps protect public health in downwind areas from the impacts of sulfur dioxide pollution. The EPA's decision confirms Oklahoma's compliance with federal clean air standards for interstate transport.
Who it affects
- ›U.S. Environmental Protection Agency (EPA)
- ›State of Oklahoma
- ›Neighboring states' air quality
- ›Sources of sulfur dioxide emissions in Oklahoma
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