Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; Utah; Reclassification as Serious Nonattainment for the 2006 Fine Particulate Matter Standard

Resumo

The Environmental Protection Agency (EPA) is proposing to reclassify to Serious the Salt Lake City, Provo, and the Logan portion of the Logan, UT/ID nonattainment areas in Utah for the 2006 24-hour fine particulate matter (PM 2.5 ) National Ambient Air Quality Standard (NAAQS). Our proposal is based on EPA's determination that the areas cannot practicably attain this standard by the applicable Moderate area attainment date of December 31, 2015. Upon final reclassification as a Serious area, Utah will be required to submit a Serious area plan for each nonattainment area, including demonstrations that the individual plans for each area provides for attainment of the 2006 PM 2.5 NAAQS by the applicable Serious area attainment date.