Approval and Promulgation of Air Quality Implementation Plans; Indiana; Redesignation of Lake and Porter Counties to Attainment of the Fine Particulate Matter Standard

요약

EPA is taking several related actions affecting Lake and Porter Counties and the State of Indiana for the 1997 annual fine particulate matter (PM 2.5 ) National Ambient Air Quality Standard (NAAQS or standard). EPA is approving a request from the State of Indiana for the redesignation of Lake and Porter Counties to attainment of the 1997 annual PM 2.5 standard. EPA is approving, as a revision to the Indiana State Implementation Plan (SIP), the State's plan for maintaining the 1997 annual PM 2.5 standard in the Chicago-Gary-Lake County, Illinois- Indiana (IL-IN) PM 2.5 nonattainment area (Greater Chicago nonattainment area) through 2025. EPA is also approving Indiana's 2025 Nitrogen Oxides (NO X ) and PM 2.5 Motor Vehicle Emission Budgets (MVEBs). Finally, EPA is approving Indiana's 2005 NO X , primary PM 2.5 , and sulfur dioxide (SO 2 ) emissions inventories for Lake and Porter Counties.