40 C.F.R. § 51.1317

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

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

[83 FR 63033, Dec. 6, 2018]