The United States has embarked on a unique experiment to improvethe quality of air in its major urban areas by altering thecomposition of fuels for vehicles. This experiment involves closecooperation between government and industry to set air qualitystandards that will introduce both better fuels and vehicles in atimely and economical fashion. The consequences of these fuelchanges will affect the petroleum and chemical industries for allenergy products and are discussed. Learn how these factors--airpollution regulations, automobile design, fuel handling and thequality of reformulated gasoline and other fuels--areinterrelated.