Approval and Promulgation of Air Quality Implementation Plans and Designations of Areas for Air Quality Planning Purposes; State of New Hampshire; Revision to the Carbon Monoxide State Implementation Plan, City of Nashua; Carbon Monoxide Redesignation Request, Maintenance Plan, Transportation Conformity Budget, and Emissions Inventory for the City of Nashua; Carbon Monoxide Redesignation Request, Maintenance Plan, Transportation Conformity Budget, and Emissions Inventory for the City of Manchester

The Environmental Protection Agency (EPA) is redesignating the Nashua, New Hampshire nonattainment area to attainment for the carbon monoxide (CO) air quality standard and approving a maintenance plan that will insure that the Nashua area remains in attainment. The EPA is also redesignating the Manchester, New Hampshire nonattainment area to attainment for the CO air quality standard and approving a maintenance plan that will insure that the Manchester area remains in attainment. Under the Clean Air Act, as amended in 1990 (the CAA), designations can be revised if sufficient data are available to warrant such revisions and the request to redesignate shows that all of the requirements of section 107(d)(E)(3) of the CAA have been met. EPA is approving the New Hampshire maintenance plans and other redesignation submittals because they meet the maintenance plan and redesignation requirements, and will ensure that the two areas remains in attainment. The approved maintenance plans will become a federally enforceable part of the New Hampshire State Implementation Plan (SIP). In this action, EPA is also approving the New Hampshire 1990 baseline emission inventories for both of these areas, transportation conformity budgets for both areas and a revision to the motor vehicle inspection and maintenance (I/M) SIP approved for the Nashua area.