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This action relates to the attainment status of nonattainment areas for the 2008 ozone NAAQS currently classified as Moderate. All Moderate areas must attain the ozone standard within 6 years of the effective date of the designation, or by July 20, 2018, unless an area is granted a 1-year attainment date extension. If a Moderate area fails to attain the standard by the attainment date, the area will be reclassified to Serious nonattainment by operation law. In this notice, EPA proposes to find that certain Moderate nonattainment areas attained the standard by the attainment date, while others failed to attain and will be reclassified to Serious nonattainment by operation of law or qualify for a 1-year attainment date extension.