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Gas Emissions Program
The full counties of Boulder, Broomfield, Denver, Douglas and Jefferson and portions of Adams, Arapahoe, Larimer, and Weld counties require a passing emission test to register a vehicle. If you are unsure if a test is required in your area, please contact your local county motor vehicle office.
1982-and-newer vehicles: An emissions test is required every two years for vehicles more than seven model years old. Your vehicle registration renewal postcard will state whether or not a test is required, or if your vehicle has qualified for the roadside emissions test. Fee is $25.
1981-and-older vehicles: A two-speed idle test is required every year at an Air Care Colorado station or at an independent, licensed test station. Fee is $15.
Change of ownership: An emissions test is required when a vehicle is sold or its ownership changes. The seller is responsible or obtaining the test. A vehicle dealer may offer customers a voucher enabling the buyer to obtain a test. The dealer is responsible for repairing or repurchasing the vehicle if it fails the emissions test, but the consumer must return the vehicle to the dealer within 3 days of the purchase. There is one exception to this rule. If a newer vehicle is sold and there are 12 months or more left on the original 7-year exemption, the vehicle does not require testing at the time of sale.
Commuters: Vehicles registered outside the region but driven into the nine-county area for 90 or more days per year for work or school must have an emissions test.
New MSO (Manufacturer Statement of Origin) vehicles purchased from a dealer are exempt from emissions testing for seven years.
Important Notice: Be sure your vehicle is due for an emissions test before going to an Air Care Colorado testing station.
State regulation requires testing stations to test all vehicles that are presented for testing. No refunds can be given for emissions tests on vehicles that were not actually due for a test. If you are not sure, call the Air Care Colorado Hotline or your local county motor vehicle office for information.
Vehicles are exempt from an emissions test for the first seven model years. For example: In 2015, 2009-2015 model-year vehicles are exempt from an emissions test.
Kit cars, electric vehicles, motorcycles, horseless carriage and vehicles registered as street rods are exempt from emissions testing requirements.
A vehicle that changes ownership requires a test if there is less than 12 months remaining on the original 7-year exemption.
Yes, as of January 2015 gasoline/electric hybrid vehicles model year 2008 and older are inspected.
A vehicle that changes ownership requires an inspection if there is less than 12 months remaining on the original exemption.
The following fuel types require a test and may be tested at Air Care Colorado:
Vehicles 1982 and Newer
1982 model-year vehicles and newer model-year vehicles require an emissions test every other year.
Visit Air Care Colorado
Test is $25 (Cash, Check, Visa, MasterCard, or Discover)
Vehicles 1981 and Older
1981 model-year vehicles and older are required to have an emissions test performed each year.
Visit Air Care Colorado or one of the independent stations listed below:
Test fee is $15 (Cash, Check, Visa, MasterCard, or Discover)
Econo Emissions & Auto Service
8330 E. Colfax Ave, Denver, CO 80220
Discount Auto Emissions
3700 Federal Blvd, Denver, CO 80211
Gas Program Area Map
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 (720) 523-6010
Arapahoe (303) 795-4500
Larimer (970) 498-7878
Weld (970) 353-3840
How do I report a smoking vehicle?
If you have seen a vehicle emitting excessive smoke you may report it to the Colorado Department of Public Health and Environment by calling the smoking vehicle hotline at 303-692-3211 or via email at email@example.com