Sulfur Dioxide (2010) Maintenance Area (Redesignated from Nonattainment) Summary

Data is current as of January 31, 2026

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Number of Areas	Number of Counties	2010 Population
25	32	1,506,449

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across groupings. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated