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Fuels of natural origin are the most frequently used source of power for spark ignition engines. Their exhaustibility causes the search for alternative sources, which are plant-derived fuels. The paper presents tests of the amount of exhaust gas components in a spark-ignition engine powered by mixtures of gasoline and ethyl alcohol. Pure ethanol and gasoline without biocomponent additives were used as research material. The experiments were performed using an exhaust gas analyzer and a particle analyzer during tests on a chassis dynamometer. The drive unit used for the tests was powered by mixtures with various ethanol content, from 10% to 100%. The analysis of the con-ducted tests showed a reduction in the amount of the formation of exhaust gas components haz-ardous to the natural environment.