Utah Northern Wasatch Front ozone rule reconsideration
AI-generated summary for informational purposes only. Not legal advice. See the original source for the authoritative text.
This proposal would undo EPA’s December 2024 finding that Utah’s Northern Wasatch Front failed to meet the 2015 ozone standard and was therefore bumped up to a stricter “Serious” nonattainment status. EPA now says the area would have met the standard by the deadline if pollution coming from outside the U.S. is taken into account, including the treatment of wildfire-smoke-affected data in the modeling. If finalized, Utah’s Northern Wasatch Front would stay in the “Moderate” ozone category instead of moving to “Serious.” That means the state would avoid some tougher reclassification-triggered obligations and contingency measures, but it would still need to finish the remaining Moderate-area clean air plan requirements. Businesses with facilities in the area should track the comment period and watch for any changes to compliance timelines or planning duties.
AI-generated summary. May contain errors. Refer to official sources for legal decisions.
Key Changes
- EPA proposes to repeal the December 2024 finding that the area failed the ozone standard and was automatically reclassified to Serious.
- EPA proposes to treat the area as having attained the standard by the deadline but for emissions from outside the United States.
- If finalized, the area stays Moderate and avoids Serious-level reclassification duties and related contingency measures, but remaining Moderate SIP requirements still apply.
Obligations
What this law requires
Utah should submit a written comment on the proposed rule, if it wishes to participate in the rulemaking record, identifying Docket ID No. EPA-R08-OAR-2024-0552 through the Federal Rulemaking Portal.
Utah must continue to satisfy the remaining Moderate-area ozone planning requirements for the Northern Wasatch Front, including the baseline emissions inventory, source emission statement rules, nonattainment New Source Review, attainment demonstration, RACM demonstration, RACT requirements, RFP demonstration, and contingency measures applicable to Moderate ozone nonattainment areas.
If the EPA finalizes the proposed repeal and 179B(b) determination, the Northern Wasatch Front area would not be subject to the Clean Air Act reclassification provisions that apply after a failure-to-attain finding and would remain classified as Moderate for the 2015 ozone NAAQS.
If the EPA finalizes the proposed repeal and attainment determination, the Northern Wasatch Front ozone nonattainment area would remain classified as Moderate for the 2015 ozone NAAQS rather than being reclassified to Serious.
If the EPA finalizes the proposed action, the area would not be subject to the Clean Air Act reclassification requirements that apply after a failure-to-attain finding, and attainment contingency measures triggered by that finding would not apply.