The Environmental Protection Agency (EPA) is approving a proposed revision to the State Implementation Plan (SIP) submitted by the New Jersey Department of Environmental Protection for New Jersey's enhanced inspection and maintenance (I/M) program. New Jersey has made several amendments to its I/M program to improve performance of the program and has requested that the SIP be revised to include these changes. Chief among the amendments EPA is approving is New Jersey's amendment to its I/M program to establish a new exhaust emission test for gasoline fueled vehicles and the extension of the new vehicle inspection exemption from 4 years to 5 years. EPA is approving this SIP revision because it meets all applicable requirements of the Clean Air Act and EPA's regulations and because the revision will not interfere with attainment or maintenance of the national ambient air quality standards in the affected area. The intended effect of this action is to maintain consistency between the State-adopted rules and the federally approved SIP.