Clean Truck Check Services

Under the Clean Air Act, CARB is responsible for developing statewide programs and strategies to reduce smog-forming and toxic pollutants emitted from mobile sources. Heavy-duty diesel vehicles greater than 14,000 pounds are major contributors to California’s air quality challenges. These vehicles still contribute the majority of on-road NOx and PM 2.5 emissions, despite significant efforts by CARB over the last 40 years to reduce NOx and PM emissions from this sector. Previous efforts include regulations and programs for new engine standards, manufacturer warranties, and durability requirements for emission control components; in-use truck rules to accelerate fleet turnover; and incentive programs to promote innovative low- and zero-emitting technologies.