40 C.F.R. § 51.1117

Fee programs for Severe and Extreme nonattainment areas that fail to attain

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For each area classified as Severe or Extreme for the 2008 ozone NAAQS, the state shall submit a SIP revision within 10 years of the effective date of designation that meets the requirements of CAA section 185.

[80 FR 12314, Mar. 6, 2015]