The Indianapolis MPA lies within a Central Indiana area designated as an Orphan maintenance area, which was defined in the February 2018 South Coast Air Quality Mgmt. District v. EPA court decision as areas that were maintenance areas for the 1997 ozone NAAQS at the time of its revocation (80 FR 12264, March 6, 2015) and were designated attainment for the 2008 ozone NAAQS in EPA’s original designations for this NAAQS (77 FR 30160, May 21, 2012). The Orphan maintenance area includes nine Central Indiana counties: Marion, Boone, Hamilton, Madison, Hancock, Shelby, Johnson, Morgan, and Hendricks counties. This airshed is identified as attainment for all other pollutants.
The IMPO currently monitors air quality and reports on transportation conformity for our region.
In accordance with the 23 CFR part 450 and 40 CFR 51.390, an Interagency Consultation Group (ICG) been formed to oversee transportation conformity analysis, and public consultation is included in the review of the projects and transportation conformity analysis results. The ICG includes representatives from the Indiana Department of Transportation (INDOT), the Madison County Council of Governments, the Columbus Area MPO, the Indianapolis Department of Public Works (DPW), the Indiana Department of Environmental Management (IDEM), and others.
The following documents act as guidelines for the ICG.