Green Book
PM-10 (1987) Nonattainment Area Summary
As of September 22, 2016| Classification | Number of Areas | Number of Counties | 2010 Population |
| Serious | 5 | 6 | 4,390,967 |
| Moderate | 32 | 26 | 4,744,324 |
| SUBTOTAL | 37 | 31 | 9,135,291 |
| GRAND TOTAL | 37 | 31 | 9,135,291 |
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