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Sulfur Dioxide (1971) Maintenance Area (Redesignated from Nonattainment) Summary

As of September 22, 2016
Designation Number of Areas Number of Counties 2010 Population
Primary 31 37 8,511,308
Primary, Secondary 8 8 255,527
Secondary 6 6 257,662
SUBTOTAL 45 48 9,024,497
GRAND TOTAL 45 48 9,024,497

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

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