• Certain areas in Colorado require vehicle emissions tests. These tests are conducted to ensure that state roads remain free of polluters.

    Colorado's Division of Motor Vehicles requires that vehicles registered in the following counties be regularly smog tested: Boulder, Broomfield, Denver, Douglas, Jefferson, and parts of Adams and Arapahoe Counties. Specific requirements are listed on the Colorado DMV Website.

    If you are selling a vehicle, you will be required to test emissions and present a new passing certificate to the buyer at the time of sale. Emissions tests are also necessary if the vehicle concerned is registered outside one of the designated counties, but used to commute there for work or school. There are also special tests necessary for diesel vehicles. Cars using alternative fuel power (electric power and, in some cases, gas power) are exempt from the testing requirement.

    The cost for an emissions test varies according to the age and type of vehicle concerned, but usually runs between $15 and $25. Vehicles categorized as street rods, horseless carriages, collector series, and farm vehicles are also exempt from testing requirements.

    You can download required Colorado Emissions Test Forms from the DMV website or find a CO Emissions Testing Center.

    Note: This article was accurate when it was published. Please confirm all details directly with the CO DMV. You can visit the CO DMV website or call the DMV for more information.

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