Biodiesel production has received considerable attention in the recent past as a biodegradable and non polluting fuel. Alkyl esters of fatty acid (biodiesel) have several outstanding advantages among other non-renewable and clean engine fuel alternative and can be used in any diesel engine without any modification. Transesterification of edible and non-edible oils is mainly used to decrease the viscosity of edible and non-edible oil; however, other properties of the oil remain same and this new

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... fuel has been called as biodiesel. It consists of edible and non-edible oil and belongs to ecological fuels because of the qualitative composition (carbon 77%, hydrogen 12% and oxygen 11%). Environmental benefits of its use include lower exhaust emission of particulate matter and green house gases, such as CO, CO 2 and SO x. Biodiesel is an environment friendly biofuel since it provides a means to recycle of CO 2 ; biodiesel does not contribute global warming. Perhaps the next most critical pollutant from the perspectives of human health and environmental quality is NO x ; NO x is the key to controlling ground level ozone and smog in urban areas. The review paper presents the results of biodiesel combustion emission on the environment.