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Areas with a Maintenance Plan Requirement Under Section 110(a)(1) of the CAA
As of June 15, 2005
| Classification | No. Areas | No. Counties | 2000 Pop. (1000s) |
|---|---|---|---|
| Serious | 6 | 6 | 1,127 |
| Moderate | 7 | 15 | 7,136 |
| Marginal | 19 | 31 | 7,950 |
| Other | 1 | 5 | 1,552 |
| SUBTOTAL: | 33 | 56 | 17,735 |
| Section 185A | 5 | 9 | 2,181 |
| Incomplete Data | 19 | 22 | 1,793 |
| SUBTOTAL: | 24 | 31 | 3,974 |
| GRAND TOTAL: | 57 | 87 | 21,709 |
County and area subtotals and grand totals may not equal sum of parts. Hillsborough Co, NH is in both the Boston (Serious) and Manchester (Marginal) area and therefore is counted only once in the totals.
The former 1-hour ozone designations and classifications as of June 15, 2004, are being retained in subpart C of Part 81 for purposes of the anti backsliding provisions of 40 CFR 51.905. 40 CFR 51.905(c) references subpart C of part 81 for the areas affected by the anti-backsliding regulation.