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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.
Quora User, As required. At atmospheric pressure, LPG is a gas, and has to be compressed in order to keep as a liquid, while the other two are liquids. All three are products of distilling crude, among others like naphtha. Petrol has a lower vapor point compared to diesel and is well suited to ignite in an air mix using a spark.