EASTERBROOK, Chief Judge.
Any "major emitting facility" built or substantially modified after August 7, 1977, in parts of the country subject to the rules about prevention of significant deterioration (PSD), needs a permit. 42 U.S.C. § 7475(a). This construction permit is in addition to the operating permits that many facilities require under the Clean Air Act and the need to comply with state implementation plans. One condition of a construction permit is installation...
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