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Vehicle Emissions Information

Emissions Test

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 will be a message on the renewal card if your vehicle passed a roadside emissions test. 


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. Click here to find a list of independent diesel stations.

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.
  • Diesel vehicles that are less than ten (10) model years old must have an emissions test every two (2) years.
  • Diesel vehicles that are more than ten (10) model years old must have an emissions test every year.
  • 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.