In areas where RFG is required, states are preempted from having RVP requirements which are different from the RFG simple model requirements unless those requirements are approved by EPA as a SIP amendment which is necessary to attain a national ambient air quality standard. In any case, the federal regulation applies and regulated parties must meet the RVP and other requirements applicable to RFG.(7/1/94)

This question and answer was posted at Consolidated List of Reformulated Gasoline and Anti-Dumping Questions and Answers: July 1, 1994 through November 10, 1997 (PDF)(333 pp, 18.17 MB, EPA420-R-03-009, July 2003, About PDF)