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 catalyst, 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 emissions from gasoline and diesel vehicles are discussed.