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Constantly increasing requirements regarding emission limits for harmful exhaust components force vehicle manufacturers to improve the construction of vehicle engines as well as exhaust gas cleaning systems. In addition to modifications in the field of technology of motor vehicles themselves, it is also important to study the impact of alternatives to petrol or diesel fuels. One of the most popular fossil fuel is liquid petroleum gas. In the paper, the results of comparative studies on the emission of harmful exhaust components of vehicles meeting the EURO3 and EURO6 standards in the field of petrol and LPG fuel use are presented. Emission measurement was performed using a portable calibration emission system from Horiba OBS-2200 under real traffic conditions. The results presented show the differences between the tested vehicles and the fuels used.