Colorado Department of Revenue
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Gas Vehicles


Person Filling up Car with Gas

Enhanced Program Area


The full counties of Boulder, Broomfield, Denver, Douglas and Jefferson as well as the partial counties of Adams, Arapahoe, Larimer, and Weld.


A quick reference map of the program area is available here.




If you are unsure if an emission test is required in your area, please contact your county at the number below.




Adams County Motor Vehicle


Arapahoe County Motor Vehicle


Larimer County Motor Vehicle


Weld County Motor Vehicle




 Tests in the Enhanced Area


  • Tests for 1982 and newer vehicles Northern Front Range and the Denver Metro Area are done by Envirotest Inc., doing business as Air Care Colorado.
  • Tests for 1981 and older vehicles may go to Air Care Colorado or independent testing facilities within the Enhanced area.




  • Vehicles 1982 and newer are $25.00
  • Vehicles 1981 and older are $15.00