Foreign Pollution Gives Utah Air Quality a Lucky Break
Published Date: 4/30/2026
Proposed Rule
Summary
The EPA is proposing to undo a recent decision that said Utah’s Northern Wasatch Front didn’t meet air quality rules for ozone by the deadline and had to be labeled a more serious pollution area. They now believe the area actually met the standards on time, but pollution from outside the U.S. made it look worse. If this change happens, local rules won’t get stricter, and the area stays in the moderate pollution category.
Analyzed Economic Effects
5 provisions identified: 5 benefits, 0 costs, 0 mixed.
Reversal of Serious Reclassification
The EPA proposes to repeal its December 9, 2024 final rule that found the Northern Wasatch Front (NWF) failed to meet the 2015 ozone standard by the August 3, 2024 Moderate attainment date. If finalized, the NWF would remain classified as Moderate (not reclassified to Serious), so the more stringent requirements associated with a Serious classification would not apply.
Attainment Found 'But for' Foreign Emissions
The EPA proposes to determine that the NWF would have attained the 2015 ozone standard by the Moderate attainment date but for emissions coming from outside the United States. If the EPA finalizes that 179B(b) determination, the area would not be subject to the reclassification provisions of Clean Air Act section 181(b)(2).
Lower Burden for 179B(b) Demonstrations
The EPA proposes to change its prior policy and will no longer expect States to show they could not have attained the ozone standard by implementing on-the-books measures (such as RACM/RACT) as a precondition for approval of a 179B(b) retrospective demonstration. The EPA also states that approval of a 179B(b) determination would not relieve the State of its obligation to submit required SIP elements except contingency measures.
Wildfire Smoke Data Excluded in Modeling
The EPA is proposing that atypical air quality data influenced by wildfire smoke be excluded from the air quality modeling that supports the 179B(b) determination for the NWF. The proposal explicitly says atypical wildfire-smoke-impacted days would be excluded when assessing whether the area would have attained the standard but for international emissions.
NAA Boundary Expanded to Include Facility
On January 6, 2026, the EPA approved Utah's request to expand the NWF nonattainment area boundary to include 12 additional townships in Tooele County so that the US Magnesium, LLC facility is within the NWF area. This proposed rule addresses the NWF area including that newly added portion and the US Magnesium facility.
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Key Dates
Department and Agencies
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