The program's stated aim is to reduce air pollution from vehicles by ensuring that cars with excessive emissions are repaired in accordance with federal and state guidelines
The STAR Program establishes performance standards for Smog Check stations and inspectors. STAR stations meet higher performance standards. Some STAR stations are licensed to perform only tests and others are licensed to perform both tests and repairs. Stations are required to post a sign showing the services they perform.
State law requires a percentage of vehicles receive their Smog Check inspections at STAR stations. The Department of Motor Vehicles registration renewal notice indicates if a vehicle is required to be inspected at a STAR station.