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

Data is current as of October 31, 2020


Designation Number of Areas Number of Counties 2010 Population
Primary 31 37 8,511,308
Primary, Secondary 9 9 258,196
Secondary 6 6 257,662
SUBTOTAL 46 49 9,027,166
 
GRAND TOTAL 46 49 9,027,166

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