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Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber.
Compressed Natural Gas (CNG): The required unit of sale for motor vehicle CNG is the Gasoline Gallon Equivalent(GGE), which is defined as 5.66 lbs. of CNG. CNG provided for vehicles is typically dispensed at pressures of 3,000 pounds per square inch (PSI) or 3,600 PSI.