Be sure your vehicle is properly warmed to operating temperature before you’re tested.  “Cold” vehicles emit higher levels of pollution than those at operating temperature. In general, 10-15 minutes of drive time will ensure proper warm-up.

Air Care Colorado

Diesel Test Centers

Diesel vehicles are not tested at Air Care Colorado test centers. For information on emissions testing requirements for diesel vehicles, visit the Air Pollution Control Division's Diesel Emissions Control page, or call them at 303-744-2442 and press 3.

Below is a listing/map of independent Diesel Test centers. Select a center for more information.

dieselLight2.pngServices light diesel    dieselHeavy2.pngServices heavy diesel    dieselBoth2.pngServices both light and heavy diesel