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Vehicle Emissions Information

An Emissions test may be required before renewing your license plates. Your vehicle renewal statement will indicate whether or not an emissions test is required. There are rare circumstances when an emissions test expires before renewal cards are printed and renewal cards may display erroneous emissions testing information.

Air Car Colorado has rapid screen emission testing (roadside emissions).  The fee of $25.00 for the rapid screen testing will be added to your registration fees at time of renewal.  There is a message on the renewal card stating your vehicle passed roadside emissions.  For additional information on emissions testing requirements see

Do Diesel-Powered Vehicles Require Inspections?

Yes, but Air Care Colorado stations DO NOT inspect diesel-powered vehicles. Diesel vehicles are inspected at independent diesel emissions testing facilities. Find a list of independent diesel stations here.

The following rules apply to diesel-powered vehicles:

  • Light-duty vehicles with a gross vehicle weight rating (GVWR) of 14,000 pounds or less are exempt from an emissions testing for four (4) years if they are purchased brand new.
  • 2003 and older vehicles are tested every year.
  • 2004 and newer vehicles are tested every two years.
  • Heavy-duty vehicles with a gross vehicle weight of 14,001 pounds or more are exempt from emissions testing (if they are purchased brand new) for the first four (4) years, and then tested every two (2) years

Emissions requirements differ from county to county in Colorado. Please call the Motor Vehicle Office at 303.660.7440 for more information.