The regulations and reporting requirements imply that credit trading for oxygen and benzene is allowed across nonattainment areas [and] not just within an area. Is that correct? Is there any geographic restriction with regard to benzene and oxygen trading

Oxygen and benzene credits may be traded across RFG areas. However, all conditions specified in 80.67(h) must be met.(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)