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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.
Liquefied Petroleum Gas - Propane LPG â Liquefied Petroleum Gas â describes flammable hydrocarbon gases including propane, butane and mixtures of these gases. LPG, liquefied through pressurisation, comes from natural gas processing and oil refining. LPG is used as heating, cooking and auto fuel.