Stay in compliance.

United Diesel Service offers Mobile Opacity Testing around the clock – seven days a week. We are a California Air Resources Board approved smoke test facility and can bring the test to your garage or truck. 

We test all size vehicles from 3 tons to 40+ tons and service all size fleets from 2 to 200 vehicles. Most tests completed in one day.

Whether it's a few trucks being tested for the first time, or a large fleet looking for a competitive bid, we can do the job quickly and cost effectively.

Call us at 626.579.4832 for a quote.

The state of California is serious about clean air and their enforcement division has grown considerably over the last year. Stiff fines for non-compliance are issued monthly and are documented at their air resources website.