40 CFR § 52.174
Control strategy and regulations: Ozone
June 9, 2020
(a) The EPA has determined that the Crittenden County Marginal 2008 ozone NAAQS nonattainment area attained the NAAQS by the applicable attainment date of July 20, 2015.
(b) [Reserved]
[81 FR 26708, May 4, 2016]
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