Approval and Promulgation of Air Quality Implementation Plans; Illinois; Revision to the Chicago 8-Hour Ozone Maintenance Plan

摘要

The Environmental Protection Agency (EPA) is approving the State of Illinois' March 28, 2014, revision to the state implementation plan (SIP) for the 1997 8-hour ozone maintenance plan for the Illinois portion of the Chicago-Gary-Lake County, Illinois-Indiana area (the Greater Chicago Area). This SIP revision establishes new Motor Vehicle Emissions Budgets (MVEB) for volatile organic compounds (VOC) and oxides of nitrogen (NO X ) for the year 2025. EPA is approving the allocation of a portion of the safety margin for VOC and NO X in the ozone maintenance plan to the 2025 MVEBs. Total year 2025 emissions of VOC and NO X for the area will remain below the attainment levels as required by the transportation conformity regulations.