The EPA is extending by six months the deadline for taking final action on petitions that three States have submitted to require EPA to make findings that sources upwind of those States contribute significantly to ozone nonattainment problems in those States. Under the Clean Air Act (CAA or Act), EPA is authorized to grant this time extension if EPA determines that the extension is necessary, among other things, to meet the purposes of the Act's rulemaking requirements. By this document, EPA is making that determination. The three States that have submitted the petitions are Delaware, Maryland and New Jersey.