Automobile Emission is one of the major problems in environment. Engine emits the carbon monoxide (CO), hydrocarbon (HC), Nitrogen oxides (NOx) and smoke density etc. NOx emission leads to dangerous effect in the environment. NOx can travel long distances, causing a variety of health and environmental problems in locations far from their emissions source. These problems include ground level ozone and smog, which are created in the atmosphere by the reaction of nitrogen oxides and hydrocarbons in the presence of sunlight. Various methods are used to reduce the Nox emission. In the present work Exhaust gas recirculation (EGR) technique is used the diesel engine with B20 biodiesel as fuel. Madhua oil is used to prepare the biodiesel in this present work. Experiments are conducted in a single-cylinder, four-stroke, water-cooled, direct-injection diesel engine coupled to an Eddy current Dynamometer with EGR and without EGR at various level (5%, 10%, 15%, and 20%). The result shows that NOx emission is reduced using EGR for diesel and bio diesel.
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