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Mobile diesel smog testing for heavy-duty diesel trucks entering California. Stay compliant with CARB’S Clean Truck Check. Conveniently located in Las Vegas, our mobile Hassle-Free Clean Truck Check ensures your fleet meets California’s Clean Truck Check requirements without the downtime of traditional smog stations.
The Clean Truck Check, managed by the California Air Resources Board (CARB), requires diesel and alternative fuel vehicles over 14,000 lbs GVWR to complete regular emissions inspections electronically. Applicable to both in-state and out-of-state vehicles operating on California roads, this program helps reduce smog and particulate emissions caused by heavy-duty trucks, buses, and motorhomes.
With over half of road pollution attributed to these vehicles, CARB’s initiative tackles air quality issues while ensuring compliance for vehicles entering California from key locations like Las Vegas.
Schedule your inspection today!
While most heavy-duty vehicles must comply with CARB’s Clean Truck Check, some are exempt, including:


We understand the critical role emissions compliance plays for truck drivers and fleet managers. As Las Vegas’s first mobile emissions testing service, we’re dedicated to bridging the gap for trucks traveling into California
At California Mobile Smog, our mission is to provide convenient, reliable, and environmentally responsible mobile emissions testing for diesel trucks over 14,000 lbs. We are committed to helping fleets and owner-operators comply with Clean Truck Check regulations while minimizing downtime and supporting cleaner air for California's communities.
To lead the mobile emissions testing industry by providing innovative, efficient, and eco-conscious solutions that prioritize customer convenience and environmental responsibility. We aim to be the go-to service in Las Vegas and surrounding areas, empowering fleets and owner-operators to achieve compliance with ease while contributing to cleaner air for future generations.
We come to you, anywhere in Southern Nevada.
Our experienced team ensures accurate and efficient testing.
We handle the paperwork and scheduling.
Avoiding roadside citations is crucial for maintaining smooth operations and avoiding unnecessary downtime. Compliance with Clean Truck Check regulations ensures your vehicles meet emissions standards, keeping them legally operable and avoiding penalties. By staying proactive with regular testing, you can focus on your business without disruptions caused by non-compliance.
According to the CARB website, here are some dates and deadlines to consider:
Starting January 2023, Clean Truck Check began roadside emissions monitoring to identify vehicles with potentially high emissions. If a vehicle is flagged, the owner will receive a Notice to Submit to Testing (NST) from CARB and must submit a passing emissions test within 30 days. This test must be conducted by a credentialed tester.
Starting Jan 1st, 2025, all non-exempt vehicles must pass an emissions inspection twice per year. Inspections can be submitted up to 90 days prior to the vehicle’s compliance deadline.
Example: A vehicle with a February 1st, 2025 compliance deadline may submit a passing emissions test as early as November 3rd, 2024.
Starting on January 1st, 2027, fleets will be required to test four times a year.
To find out when your truck needs to be tested, visit the CARB website and enter your VIN or registration details. CARB assigns deadlines based on registration, and missing them can lead to hefty fines.
Source: arb.ca.gov
Bolded months indicate the month the compliance fee will be due. As with CA registered vehicles, non-CA registered vehicles are required to ensure that they have paid their annual compliance fee and have no outstanding enforcement violations as part of their compliance demonstration.
EXCELLENT Based on 97 reviews Posted on Google R DA1TRANSPORTLLCTrustindex verifies that the original source of the review is Google. Great communication reliable and fast work 💯Posted on Google OTM DELIVERY LLCTrustindex verifies that the original source of the review is Google. Had a great experience. Thank you so much Andy!Posted on Google P. FordTrustindex verifies that the original source of the review is Google. Want to share my experience at California Mobile Smog. I have a vehicle registered in CA that I keep in Vegas. Every 2 years I have to drive to Baker, CA. to have my car smogged but the place is only open on Saturdays. CMS is a much better alternative. The guys there (Andy & Ryan) were very professional. The service was fast and I got my tags in the mail in 12-days. Thanks CMSPosted on Google Brent CajthamlTrustindex verifies that the original source of the review is Google. Andy was great, he was able to get my coach smogged in short notice! I would highly recommend!Posted on Google Ronald AbarrTrustindex verifies that the original source of the review is Google. Wow!!! These guys are fantastic (Ryan and Andy) fixed my truck like they said, had it ready earlier than expected. Picked up and dropped off my truck . I live in Henderson and really appreciate the extra mile they go. Very dependable, honest, trustworthy and knowledgeable. It's a shame that I can only give 5 stars, they deserve so much more. These people are very rare in this time and age. Thank you Ryan and Andy, your absolutely the best.🙏😁Posted on Google Sean St JohnTrustindex verifies that the original source of the review is Google. Excellent service they went above and beyond the call of dutyPosted on Google JC OreTrustindex verifies that the original source of the review is Google. Got taken care of a CARB compliance in less than 20 minutes, thank you guys.Posted on Google Mr. ToddTrustindex verifies that the original source of the review is Google. Andy was very friendly, professional and quick. It's hot as hell in Vegas. Keep up the great work😊😊😊Posted on Google ELLE & CHURRO The cutest Pitbull coupleTrustindex verifies that the original source of the review is Google. Great service. All very polite. Will definitely recommendVerified by TrustindexTrustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more