Approval and Promulgation of Air Quality Implementation Plans; Maryland; The 2005 ROP Plan for the Baltimore Severe One-Hour Ozone Nonattainment Area: Revisions to the Plan's Emissions Inventories and Motor Vehicle Emissions Budgets To Reflect MOBILE6

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EPA is proposing to approve State Implementation Plan (SIP) revisions submitted by the State of Maryland. These revisions amend the Baltimore severe 1-hour ozone nonattainment area's (the Baltimore area's) rate-of-progress (ROP) plan for the 2005 milestone year. The intent of these revisions is to update the plan's emission inventories and motor vehicle emissions budgets (MVEBs) to reflect the use of MOBILE6 while continuing to demonstrate that the ROP requirement for 2005 will be met. The State of Maryland also submitted revisions which amend the contingency measures associated with the 2005 ROP plan. These revisions are being proposed for approval in accordance with the Clean Air Act (the Act).