EPA is taking final action to fully approve the Pinal County Air Quality Control District (Pinal or District) operating permits program. The Pinal program was submitted in response to the directive in the 1990 Clean Air Act (CAA) Amendments that permitting authorities develop, and submit to EPA, programs for issuing operating permits to all major stationary sources and to certain other sources within the permitting authorities' jurisdiction. On October 30, 1996, EPA granted interim approval to Pinal's operating permits program. The District revised its program to satisfy the conditions of the interim approval, and EPA proposed full approval in the Federal Register on September 20, 2001, contingent upon Pinal submitting the rules to EPA as a revision to its part 70 program. Pinal County did so, and EPA did not receive any comments on the proposed action. This action promulgates final full approval of the Pinal operating permits program.