Accelerate moderately as you pass the testing van. Moderate acceleration is required to produce the most representative sample of your vehicle’s exhaust emissions. Therefore, deceleration or heavy acceleration may result in an invalid reading.

Air Care Colorado Consumer Information

Wait Time Note: Please keep in mind that the wait times include an average test time of 20 minutes, so if the wait time for a station says "30 minutes," the actual wait prior to the test is about 10 minutes.  The wait times are updated approximately every 15 minutes.