Smoking vehicles are the exception, not the rule. This program will require the operators of smoking vehicles take the necessary steps to eliminate exhaust smoking. The regulations require that diesel trucks and buses undergo an annual smoke emissions inspection in conjunction with their required commercial vehicle safety checks. Excessive smoke is the exception and not the rule.
Smoke represents unburned fuel.
Smoke testing programs are cost effective solutions that are good for the environment, for regulators, for truck and bus operators and the public. Massachusetts will join twelve other states which currently have programs to control excessive exhaust smoke. States adopting these programs can receive air quality credits toward meeting their clean air goals. Endorsed by the Federal EPA, the smoke testing programs have received encouragement and support from the Diesel Technology Forum . The diesel industry supports state-lead efforts to identify gross emitters of smoke.