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Previous Section 185A Nonattainment Areas No Longer Subject to the 1-hour Standard
As of June 15, 2005
| Areas Listed Alphabetically | Design Value (ppm) |
Average Expected Exceedance |
No. Counties NAA |
2000 Pop. (1000's) |
EPA Region |
State | Located in a CMSA MSA |
|---|---|---|---|---|---|---|---|
| Chico, CA | 0.100 | 0.0 | 1 | 203 | 9 | CA | msa |
| Imperial Co, CA | 0.110 | 0.0 | 1 | 142 | 9 | CA | no |
| Yuba City, CA | 0.120 | 1.0 | 2 | 114 | 9 | CA | msa |
| 3 Total Areas | 4 | 459 | |||||
"Section 185A" was previously called "Transitional". Prior designation retained by operation of law in 1991 but without measured violation based on 1987-89 data. Totals were adjusted to account for multiple areas in a single county. 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.