The EPA issued a final rule on April 30, 2004 (69 FR 23951) that set forth certain nationally-applicable requirements for implementation of the 8-hour ozone national ambient air quality standard (NAAQS)--the phase 1 rule. Section VI.L. of the preamble (69 FR 23995), provided that petitions for review challenging the final rule should be filed in the "appropriate circuit." The Clean Air Act (CAA) provides that petitions for review of any nationally applicable regulations may be filed only in the United States Court of Appeals for the District of Columbia Circuit. This document modifies section VI.L. to clarify that petitions for review of the phase I rule must be filed in the United States Court of Appeals for the District of Columbia Circuit.