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Envirotest has operated the Air Care Colorado emissions testing centers, under contract with the State of Colorado, for 25 years. Envirotest is a member of the Colorado Better Business Bureau. For more than 30 years, Envirotest has focused on one goal-providing the vehicle inspection and maintenance industry with state-of-the-art equipment and solutions for vehicle emissions programs throughout the world.

Envirotest's experience in supporting decentralized vehicle emissions programs (also called test-and-repair or garage programs) extends over 20 years, including providing referee and quality assurance services in both Alaska and California.
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Air quality is important to everyone! Exposure to high levels of air pollution can aggravate heart disease, asthma and other respiratory diseases and conditions. Colorado has a long history of taking proactive measures-both mandatory and voluntary-to protect the quality of the air we all breathe. The regular inspection of emissions and the maintenance of our vehicles has been a key part of protecting air quality in parts of Colorado since 1981.
Select the desired county. This will display a map with the address, phone number, hours, and website for each of the county's motor vehicle registration offices. While we attempt to keep these listings current, this information can change without notice, so please call ahead. Note: The enhanced emissions program operates in Adams, Arapahoe, Boulder, Broomfield, Denver Douglas, Jefferson, Larimer and Weld counties.
In Colorado, state regulation does not require safety inspections (tire pressure, headlights, etc.). However, your vehicle will be subject to a brief visual check to ensure that it does not have any visible conditions that would make it unsafe to evaluate. Inspectors will look for obvious fluid leaks, worn tires, etc.
Opus is the leader in vehicle emission testing in the U.S., providing turnkey programs that help government agencies meet their air quality objectives. Opus designs, builds and operates emission testing programs in states and counties across the U.S., tailored to local requirements. Opus works closely with government partners to help them increase compliance with air quality standards and achieve their public policy goals.
Reviews (27)
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David Glover
May 15, 2022
They helped me even though I arrived at 5:20. My technician was a friendly older gentleman who told good jokes. Overall great customer service.
Kevin Shelton
May 12, 2022
Every time I've gone there haven't waited more than 10 minutes it's a great place to go probably shouldn't be saying that because now the line will get longer
Eva Simons
Apr 09, 2022
Short lines, at first people seemed what's a good word like then didn't care. But they were short staffed they had 1 person that was testing the cars & several lanes of people preparing the cars for testing. The tester ( my vehicle couldn't test no communication between the obd & system) told me that for the vehicle I should check the fuses. He was right that fuse was shot so we replaced it & it blew again when they went to connect again. I highly recommend this place but please understand everyone has good days bad days & gets slammed so too busy.
Emily Foos
Mar 12, 2022
This location always seems to have the shortest wait, even during normally busy hours. Last time I was there though, it was about 15min before they closed.not a single car ahead of me & they didn't act annoyed or anything (like employees at most places do) that someone rolled in right before closing time. I'm not telling you to go right as they are closing, but I was in and out in less than 10min!.just sayin.
Adela Ibric
Mar 11, 2022
A Thursday at 12pm- in and out in less than 30 min. Shoutout to this crew working here to make everyone's day easier!
Jon Camrud
Feb 07, 2022
No wait at all at 8:30 on a Wednesday morning in mid February. Very efficient process, and amiable workers. Drove by the Warren Avenue location on the way over, and the line was already running out the parking lot down the street. The guy who checked me out said this location doesn't get busy until 10:30 AM most days.
Michael Oboley
Jan 25, 2022
The fastest emissions place in Denver. I always go here because hardly ever a line. When I came today only 1 car was there so I was in and out in 15 min. The cashier's are nice and friendly.
Matthew Hay
Jan 08, 2022
Test went fine aside from the lack of organization and long wait time. My main concern here is that literally one day after passing emissions, the catalytic converter was stolen from my vehicle at my home. I have been parking in the same area for months and no issues but literally one day after someone knows my car passes emissions (CO2 and catalytic converter intact) with model and address - my converter gets stolen. Take this for what you will but my guess is that employees involved are directly or indirectly forwarding information so that vehicles can be later vandalized for profit.
Meghan W.
Dec 10, 2021
First time reviewing a smog test but hey the employees were amazing and deserve kuddos. Typically when I go take my car in for a test I'm not met with even a smile. The folks who helped me were kind, efficient, and fast. If I ever need help again I'm going here!
Darl G.
Nov 17, 2021
I took my car to the Colorado Air Care CO in their Castle Rock location to get a VIN verification. I had two people stand by my car and say that they prioritize emissions testing over VIN Verifications. There was NO other car on the lot. None inside, none waiting or none had even taken a priority ticket. I was shocked and looked around in amazement and questioned these two people on WHO they were prioritizing?

It takes less than 5 minutes to do a VIN verification. One of them sternly looked at me and said that he cannot have others wait as emissions are prioritized. Really? I asked. Who exactly are you prioritizing? He again looked at me and said that he cannot do my verification. So I had to take over an hour of my time and drive both ways to Highlands Ranch to get this verification. Ridiculous?

I think so! BTW, the person who did this verification in the Highlands Ranch location was awesome. He did this right away with no waiting and it was done in less than 5 minutes. He was very courteous. Interestingly enough, there were about 8 cars waiting for their emissions testing. I am disgusted by this incident.
Lucia M.
Oct 08, 2021
Pulled into the bay as directed. Two minutes later, he was done plugging /unplugging a wire into my car. Told to wait for the car in front of me to finish its testing. 15 mins. later, I asked if I could move into the other, empty bay to finish testing. He said, "no, there's another car pulling up." Finally, the car in front of me finished up. Apparently, they thought it was perfectly fine to allow me to sit and wait for 20 mins. in order to pay the $25. fee. Miserable people make for lousy customer service.
Caitlin C.
Apr 28, 2021
Pulled right and and was helped immediately. The employees were so kind and quick. From start to finish, I was there less than 10 minutes.
Charmaine R.
Aug 17, 2020
Feels weird to review a smog center. Anyway came in Saturday morning at 10pm. Anticipated it would be a long wait. But honestly I was the only person there. Gasp! Drive there wasn't too long, but very surprised that this smog check centers are so few and far apart. Nevertheless, it was super quick I drove in they have separate lanes (doesn't seem to be separated in any specific fashion) just to efficiently service citizens.

They looked at my car (vin, mileage, engine light activity asked if it was a front wheel drive) Not a whole lot mechanically was done to my car. I drove up to the next stop paid the bill about ~$40 (yup they take card) total they handed me two slips of paper and I was on my merry way. Everyone wears a mask here. So that's cool also yeah no mask no service.
T. D.
Dec 14, 2019
Very courteous staff, and they can see you just minutes before they close. I'm actually in Denver but this location is the one to come to for your emissions testing! Usually out of there in 10 mins or less! Great people!
Kim F.
Apr 04, 2019
So. I chose to pop in here with my new car(my used, but new to me car) around 4 pm on a Thursday. Gish, I picked the right time! In and out in 14 minutes. Super courteous staff, everybody acting efficiently, super happy I picked this time, worked perfect for me
Elaine H.
Mar 23, 2019
The entire inspection and wait took 8 minutes! They asked the age of my SUV and directed me to a short line. I was next. Just breezed through and I paid and left. Very happy with the great service. None of the lines were very long at late Friday morning.
Julie C.
Jan 14, 2019
Came in on a Monday at 10:30am and was in and out in less than 15 minutes. Needed an emissions check and vin verification and service was efficient and friendly.
John J.
May 15, 2018
Ran. At through 2 times. Totally unnecessary. My car is an ultra low emissions vehicle, yet subject to a double test. Staff had no answers. Everyone wants clean air. However this program is expensive ineffective since old cars are the problem.
Christian B.
Nov 25, 2017
I remember when I first moved to Colorado and had to get my vehicle "emissions certified" they put it on the dyno and connected many hoses to it and checked everything out. now, many years later and with the EPA and other federal government agencies mandating stricter and tighter rules for car manufactures to produce cleaner running cars all the employees at this location did to my vehicle now was to look at my gas cap to see if it was venting fumes or not. thats it and nothing else, and my wallet was $25 lighter. what a racket, its like standing in line paying for somebody to punch you in the stomach!
Nate N.
Sep 29, 2017
I had a decent experience here, surprisingly since it's the end of the month. I drove up, grabbed a gate ticket, waited in line. About 10 mins, there were 2 lines one for regular vehicles and another for AWD and 4x4. I took the right side since I have a truck. The other lane opened up and the attendants ushered me into the faster line. I waited less than 10 mins in a long corridor, you can watch them conduct the emissions testing on your vehicle. There's a vending machine at the front of the waiting area.

When your vehicle is done they wave you over to pay and get your emissions certificate. Better than I expected and they also do VIN verification for your vehicle for $20, the emissions test is $25. You'll need them if you want to register your vehicle for Colorado plates.
Laurel M.
Aug 19, 2017
Beyond dishonest. Allowed people who had just arrived to cut in line after I had been there 40 min in line, and then spent 20 min abusing my car while they passed 5 others in the other lane. They forced my car to fail emissions and it barely failed (.19 above the limit because they had it at 60-75 mph stop and go for 20 min!) but they still refused to tell me the results until they grabbed payment. So dishonest and so disappointing.
Todd A.
Jun 26, 2017
Everytime I go they are fast. Get the job done and I'm on my way. Yes they get busy so you may have to wait but that's life. They do their best. They don't talk much but I'm cool with that as it means they are plugging along. They are always friendly. Can't complain.
Roger R.
Nov 10, 2016
I just took my car to the Air Care Colorado center on Teller St. in Broomfield. What a great experience! As I arrived I immediately pulled my car into a bay. 15 minutes later I was on my way after the emissions test and a VIN Verification. The staff was courteous, knowledgeable and very efficient. I am very pleased with my experience there.
Gary B.
Apr 17, 2016
Hey folks. In my book this smog check station was very friendly very effective very efficient very quick.these employees are very knowledgeable in& out in less than 15 mins.really like this place.
Allen T.
Feb 25, 2016
Fastest emission test I have ever done. They now accept credit cards. (Visa, Master, and Discover) I gave them my car to test, when I came out of the restroom, it was already done! ( under 5 minutes) Impressive!
Katie R.
Jul 09, 2014
FRAUD ALERT: These people will take you for everything you have if you don't walk in there 100% informed. We went in for an emissions test in order to switch our tags over to CO plates, and were told that in addition to the emissions test we also needed a signature on the VIN form we had. They quoted us $20 for the signature on top of the $25 for the emissions test. Low and behold, we were told we did NOT need that at the DMV. These people are scam artists enabled by government mandated emissions tests.
Ray L.
Aug 07, 2013
My car had an emissions test done by the dealer in June. Not familiar with Colorado emissions, I decided to drive down here and ask if that test would be sufficient to register my vehicle. After one employee said it would be ok, another employee said no, I would have to do another on my own, so I went ahead and had another check done and paid up. Turns out that is incorrect, and I'm currently working on getting a refund.