Sulfur Dioxide (1971) Nonattainment Area Summary

Data is current as of November 30, 2025

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Designation	Number of Areas	Number of Counties	2010 Population
Primary	5	4	17,885
Primary, Secondary	2	2	1,087,873
Secondary	0	0	0
SUBTOTAL	7	6	1,105,758
GRAND TOTAL	7	6	1,105,758

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