The DNREC Inspection and Maintenance (I/M) program is a mandatory control measure to help the State of Delaware meet the National Ambient Air Quality Standard (NAAQS) for ozone.
Division of Air Quality
Low Enhanced Inspection and Maintenance Program (Kent and New Castle Counties)
(7 DE Admin. Code 1131)
Motor Vehicle Emissions Inspection Program (Sussex County)
(7 DE Admin. Code 1126)
Under the I/M program, vehicles undergo emissions testing or emission control systems testing as part of the vehicle registration or renewal process. By requiring that vehicles with excess emissions or malfunctioning emissions control systems be repaired and/or maintained, the motor vehicle emissions testing program is a meaningful element of Delaware’s State Implementation Plan (SIP) to meet federal air quality standards.
Motor vehicle emissions testing is performed on all gasoline and diesel powered light-duty vehicles weighing up to 8,500 pounds gross vehicle weight at the Delaware Division of Motor Vehicles Inspection Facilities.
The I/M program inspection requirement is biennial, requiring vehicles to pass safety and emission inspections once every other year. The inspections are performed at no charge to the vehicle owner. The first seven model years are exempt from emissions testing.
Under the state’s motor vehicle emissions regulations, automotive repair technicians may become certified as emission repair technicians and may apply for a permit to conduct on-road OBD-II drive-cycle testing on vehicles without current registration. Certification may require advanced training. In some cases, work by a Certified Emission Repair Technician will count towards a DMV inspection waiver.