40 CFR § 51.153 - Reevaluation of episode plans.
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§ 51.153 Reevaluation of episode plans.
(a) States should periodically reevaluate priority classifications of all Regions or portion of Regions within their borders. The reevaluation must consider the three most recent years of air quality data. If the evaluation indicates a change to a higher priority classification, appropriate changes in the episode plan must be made as expeditiously as practicable.