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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 62 reviews Posted on Timothy MitchellTrustindex verifies that the original source of the review is Google. Great and professional service would recommend them to anyone,will use again in the futurePosted on Polywog DevineTrustindex verifies that the original source of the review is Google. We had an excellent experience with California Mobile Smog. Ryan, their mobile service technician, was fast, responsive, and incredibly professional. He came directly to our semi at a truck stop and had everything wrapped up in just 5 minutes. Friendly, efficient, and CARB-compliant—this is the kind of service truckers dream of. Highly recommend California Mobile Smog for anyone needing quick and reliable roadside smog checks!Posted on The Grown Man ShowTrustindex verifies that the original source of the review is Google. The absolute best, quick 5 minute. Even brought me a sandwhichPosted on Lonnie SummerfieldTrustindex verifies that the original source of the review is Google. Very professional and prompt. Will work with you on a meetup to have your carb inspection done.Posted on Lakreasha LanierTrustindex verifies that the original source of the review is Google. Ryan was the absolute best! He was so patient and Efficient! Quick fast and easy! We’ll definitely use him againPosted on Vladimir YablochkinTrustindex verifies that the original source of the review is Google. Very fast and good serviceVerified 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