Jump to main content or area navigation.

Contact Us

Green Book Nonattainment Areas

1-Hour Ozone (1979) Section 185A Nonattainment Areas - NAAQS Revoked

As of June 15, 2005

Chico, CA
Imperial Co, CA
Yuba City, CA

Classified and Incomplete Data areas not included. Prior Designation retained by operation of Law, but without measured violations. Section 185A areas had 3 complete years of data. Incomplete data areas had no data or less than 3 complete years of data at time of classification. "Section 185A" was previously called "Transitional". 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.

Jump to main content.