1-Hour Ozone (1979) Nonattainment Area Summary - NAAQS RevokedData is current as of May 31, 2021
|Classification||Number of Areas||Number of Counties||2010 Population|
|Rural Transport (Marginal)||2||2||0|
County subtotals and grand totals may not equal sum of parts.
Part counties are only counted one time within groupings.
"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.