Colorado Department of Revenue
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Emissions Information

 

Rocky Mountain Road

Gas Vehicles

Enhanced Program Area

The full counties of Boulder, Broomfield, Denver, Douglas and Jefferson as well as the partial counties of Adams, Arapahoe, Larimer, and Weld.

 

 

Diesel Vehicles

Emissions Program Area

The full counties of Boulder, Jefferson, Broomfield, Denver, and Douglas, and the partial counties of Adams and Arapahoe, Larimer, Weld, and El Paso.