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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.
Natural gas, a fossil fuel comprised mostly of methane, is one of the cleanest burning alternative fuels.It can be used in the form of compressed natural gas (CNG) or liquefied natural gas (LNG) to fuel cars and trucks.atural gas, a fossil fuel comprised mostly of methane, is one of the cleanest burning alternative fuels.