Air Quality State Implementation Plans; Approvals and Promulgations: Utah; Northern Wasatch Front; 2015 8-Hour Ozone National Ambient Air Quality Standards; Reconsideration and Repeal of Finding of Failure to Attain and Reclassification to a Serious Nonattainment Area; etc.

A coalition of public interest groups, including the Sierra Club and Earthjustice, opposes the EPA's proposal to determine that the Northern Wasatch Front would have attained ozone standards but for international emissions. They argue the proposal is unlawful, arbitrary, and capricious because it improperly relaxes requirements for states to implement local pollution controls and ignores the ongoing health and environmental impacts of ozone pollution in the region.

The Clark County Department of Environment and Sustainability (DES) supports the EPA's proposed approval of Utah's Clean Air Act §179B(b) demonstration for the Northern Wasatch Front. They argue that the demonstration correctly identifies international emissions as the cause of ozone exceedances, thereby allowing Utah to maintain its Moderate classification and avoid more stringent and costly "Serious" nonattainment requirements.