The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the New Jersey Department of Environmental Protection. This revision establishes an updated ten-year carbon monoxide (CO) limited maintenance plan for the New Jersey portion of the New York-Northern New Jersey-Long Island (NYNNJLI) CO area which includes the following areas: Hudson, Essex, Bergen, and Union Counties, and the municipalities of Clifton, Passaic and Paterson in Passaic County. New Jersey qualifies for a limited maintenance plan, rather than a full maintenance plan, because monitoring concentrations of CO are less than 85% of the standard. In a limited maintenance plan, future-year projection inventories and transportation conformity budgets are not required. In addition, EPA is also approving the 2007 Attainment/Base Year CO emissions inventory and the shutdown of 5 CO maintenance monitors in New Jersey. The New Jersey portion of the NYNNJLI CO area was redesignated to attainment of the CO National Ambient Air Quality Standard (NAAQS) on August 23, 2002 and a maintenance plan was also approved at that time. By this action, EPA is approving a second limited maintenance plan for this area because it provides for continued attainment of the CO NAAQS for an additional ten years. The intended effect of this rulemaking is to approve a SIP revision that will insure continued maintenance of the CO NAAQS.