Jump to main content.


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.


Local Navigation


Jump to main content.