The U . S . Motor Vehicle Emission Control Programme

The United States motor vehicle emission control programme is noted for its pioneering role and success in limiting exhaust pollution, utilising the three-way catalvst, cleaner,fuels, improved engine design and calibration strategies. The progressive lowering of the emission limits by technology-forcing legislation via the agencies of the U S . Environmental Protection Agency and the California .state legislature has resulted in cleaner air: Here, progress to date and future intentions for emissiotzs from gasoline and diesel vehicles are discussed.