Tests for Those Who Reside Outside the Program Area

If you reside outside of the seven-county Denver-Boulder area but commute into the area 90 days or more per year for employment or school, an emissions test in the enhanced area is required for your vehicle. This applies to:
 

Commuters into the Denver-Boulder area;

College students who keep a vehicle locally but whose legal residence is in another part of the state or out of state;

Military personnel who are stationed here and keep a vehicle here, but whose legal residence is outside of the emissions program area;

Anyone who resides outside the program area or outside of the state but who is in the Denver-Boulder area for their employment or schooling for part of the year (90 days or more) and brings a vehicle with them.