The aim of this work is to find out composition of exhaust gases from I.C engine when CNG, LPG, Petroleum are used. The main consequence of exhaust gases are environmental pollution. The environmental pollution depends upon presence of pollutants like CO, NOx, HC & PM. This paper aspires to find out the fuel that emits minimum pollution when used in the same automobile, thereby finding a cleaner,
... [Show full abstract] environment friendlier fuel. The results presented in the project are obtained from an experimental study carried out on a Maruti Alto Car. Experimental investigation indicates that CNG, LPG and petrol have significant effect on exhaust gases. In spark ignition engines, the output parameter is achieved by controlling various input fuels. This paper discusses the effects of various input fuels on exhaust gases.