Approval and Promulgation of Air Quality Implementation Plans; Illinois: Motor Vehicle Inspection and Maintenance

EPA is approving portions and conditionally approving other portions of a vehicle inspection and maintenance (I/M) State Implementation Plan (SIP) revision submitted by the State of Illinois on June 29, 1995, based on the State's April 22, 1996, letter of commitment to submit certain items within one year of the final conditional approval. This revision provides for the adoption and implementation of an enhanced I/M program in both the Chicago severe ozone nonattainment area and the East St. Louis moderate ozone nonattainment area. Both areas are required to attain the National Ambient Air Quality Standards (NAAQS) as specified under the Clean Air Act (Act) by 2007 and 1996 respectively. Illinois indicates that the implementation of this important program in the two areas stated above, will reduce vehicle emissions which contribute to the formation of urban smog in Illinois by more than 38 tons per day. In support of the conditional approval of the SIP revision, the State has submitted the State's Request-For-Proposals as supplemental information to the SIP. In addition, the State has committed in an April 22, 1996, letter to submit to EPA as supplemental information in support of the SIP, the State's final I/M contract and any rules necessary to address the requirements identified in the analysis section of this document.