Real motor truck roads and a federal statute controlling operation in every state are now necessary
Exhaust Emissions from Heavy-Duty Trucks Tested on a Road Course and by Dynamometer
An Evaluation of Restorative Maintenance on Exhaust Emissions from In-Use Automobiles
Exhaust Emissions from In-Use Passenger Cars Equipped with Three-Way Catalysts
In-Use Emissions of 1980 and 1981 Passenger Cars: Results of EPA Testing