Air has become much polluted due to severe increase in the number of automobiles. The level of air pollutants contributed from S.I. engine automobiles is very high, so, an appropriate remedial action is necessary to lower its severity. The aim of the present research work is lower the level of level of pollution from petrol engine automobiles by using catalytic converter and nano-particles. During the research work, Copper nano-particles were coated on a catalytic converter and experiments were conducted after using it in a S.I. engine test rig. The results of the experiment demonstrate the effectiveness of using Copper nano-particles on a suitable catalytic converter for pollution control. This research also paves the way for further research to modify a catalytic converter for achieving further reduction in the level of exhaust gases released from vehicles. On the suitable modification of catalytic converter, the performance of a catalytic converter can be improved.