Redesignation of Portions of Westmoreland and Cambria Counties, Pennsylvania for the 2010 Sulfur Dioxide (SO2) National Ambient Air Quality Standards (NAAQS)

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The Environmental Protection Agency (the EPA or the Agency) is finalizing the redesignation of portions of Cambria County and Westmoreland County, Pennsylvania, to "nonattainment" for the 2010 1- hour primary sulfur dioxide (SO 2 ) national ambient air quality standard (NAAQS or standard). Westmoreland County was previously designated "attainment/ unclassifiable," and Cambria County was designated "unclassifiable." The EPA notified the Commonwealth of Pennsylvania of its intended redesignation of portions of Cambria and Westmoreland counties on February 17, 2023, and published a Notice of Availability (NOA) for this action on February 12, 2024. The EPA's redesignation of portions of these counties is based on modeled violations of the 2010 1-hour primary SO 2 NAAQS.