Colorado
For Colorado, counties where testing is required is all or portions of Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson, Larimer, and Weld counties; vehicles covered / exempt is owners of gasoline-powered vehicles in the Front Range area of Colorado; recent or pending change is Starting in 2026, these Colorado drivers will have access to self-service kiosks for On-Board Diagnostics (OBD) emissions tests that will be available 24/7 at convenient locations; program / authority is Automobile Inspection and Readjustment (AIR) program, verified against its source on 2026-08-18.
- State
- Colorado our reading
- Counties where testing is required
- all or portions of Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson, Larimer, and Weld counties verified
- Vehicles covered / exempt
- owners of gasoline-powered vehicles in the Front Range area of Colorado verified
- Recent or pending change
- Starting in 2026, these Colorado drivers will have access to self-service kiosks for On-Board Diagnostics (OBD) emissions tests that will be available 24/7 at convenient locations verified
- Program / authority
- Automobile Inspection and Readjustment (AIR) program verified
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
The commission approved of updates to Regulation 11, which applies to owners of gasoline-powered vehicles in the Front Range area of Colorado. This area includes all or portions of Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson, Larimer, and Weld counties. Starting in 2026, these Colorado drivers will have access to self-service kiosks for On-Board Diagnostics (OBD) emissions tests that will be available 24/7 at convenient locations.
— cdphe.colorado.gov, retrieved 2026-08-18
Source
- cdphe.colorado.govhttps://cdphe.colorado.gov/apcd/motor-vehicle-emissions