Gas Vehicles

Gas Emissions Program

Which counties require an emissions test to register a vehicle?

  • Boulder
  • Broomfield
  • Denver
  • Douglas
  • Jefferson
  • Portions of Adams
  • Portions of Arapahoe
  • Portion of Larimer
  • Portions of Weld 

If you are unsure if a test is required in your area, please contact your local county motor vehicle office. If you have a question about whether you need a test in Adams, Arapahoe, Larimer, or Weld County contact your local DMV office at the number below.

  • Adams Couty (720) 523-6010
  • Arapahoe County (303) 795-4500
  • Larimer County (970) 498-7878
  • Weld County (970) 353-3840

Gas Program Area Map

AirCare Colorado has a tool to view the last two emission inspections on a particular gas vehicle.