Description:
Background material and fact sheets about this California state program that inspects heavy-duty diesel trucks and buses for excessive smoke emissions. Document topics include the Periodic Smoke Inspection Program, reduction of emissions from transport refrigeration units (TRUs), air quality concerns related to the travel of heavy-duty vehicles over the Mexico-California border under the North American Free Trade Agreement (NAFTA), and trends and outcomes of the inspection programs. From the California Air Resources Board (ARB). |