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* University of Kragujevac, Faculty of Engineering, Sestre Janjić 6, 34000 Kragujevac, Serbia; sasa.milojevic@kg.ac.rs Noise pollution due to road traffic is a major global concern because of its negative impact on the quality of life in communities everywhere. In Republic of Serbia, traffic noise has become an increasingly noticeable and serious problem in large cities like Belgrade, Novi Sad, Niš, Kragujevacand Kraljevo.To resolving the current situation, in cities where exists the intensive noise pollution from diesel vehicles, as a special contribution to reducing noise in road traffic, we were studied the replacement of the existing city busses with new propulsion system on natural gas, resulting in less noise emission. The reduction of noise emission was confirmed during parallel tests of the buses with drive on diesel and natural gas. Intensive noise measurements were conducted according to the Regulation UN ECE 51R.

CNG propulsion system for reducing noise of existing city buses