Green Book
Lead (2008) Nonattainment Area Summary
As of September 22, 2016| Number of Areas | Number of Counties | 2010 Population | 20 | 22 | 9,665,808 |
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