Natural Gas Fueled Vehicles Exhaust Emissions and Operational Characteristics 700078

Natural gas fuel in a lean mixture with 25 % excess air operates satisfactorily in an otherwise normal automotive engine. All exhaust emissions known to contribute to air pollution are reduced to levels meeting or bettering currently proposed standards. Dual-fuel operation with gasoline as a standby fuel permits immediate use of natural gas prior to the establishment of a widespread fueling network.