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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.

If you would like to view the last two emission inspections on a particular gas vehicle, click here. LINK IS TEMPORARILY DOWN