Prevention of Significant Deterioration (PSD) delegation agreements allow state agencies to issue PSD permits under 40 CFR 52.21. A PSD Permit issued through a delegation agreement is considered a federal permit rather than a state permit (under a SIP approved program).
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Pima County PSD Delegation Agreement (PDF)(9 pp, 994 K,
06/05/2018)
Agreement for Delegation of Source Review under the Federal Prevention of Significant Deterioration (PSD) Program Set Forth in 40 CFR 52.21 by the United States Environmental Protection Agency, Region 9 to the Pima County Air Quality Control District.