The interest in organic farming, due to the increasing demand for food free of residues of plant protection chemicals, mineral fertilizers and heavy metals, is getting bigger and bigger. However, it should be remembered that in addition to avoiding the use of chemical methods for plant protection and care, as well as growth stimulators and antibiotics in animal breeding, it is also important to reduce the negative effects on the natural environment. Therefore, the use of energyefficient machines, which additionally do not pollute the environment excessively, is one of the elements of organic farming. In recent years, the issue of reducing nitrogen oxides and particulate solids emitted by engines in agricultural tractors is considered more and more rigorously. The aim of this study was to analyze motor agricultural machines used in farms in Krotoszyn County in terms of exhaust emission standards. The researches covered 30 randomly selected farms, in which 12 agricultural tractors were used. Analysis of the results showed that the majority of tractors used in agriculture in Krotoszyn County do not meet any exhaust emission standards and that these machines are obsolete.