Air pollution in Slovenia and Europe is becoming an increasingly topical issue. Particles PM10 in the air arise as a consequence of natural and anthropogenic activity, and thus have a negative impact on human health and the environment itself. The causes for high concentrations of particles PM10 in the air are transport, industry, residential combustion, secondary sources, salting roads and resuspension. Weather conditions and geographical location also have an influence on high concentrations. The area of particles in Slovenia is defined in Regulation of sulfur dioxide, nitrogen oxides, particulate matter and lead in ambient air. In the thesis we analysed the pollution of air in Slovenia at different measuring places for several years using the method of discussion. We obtained the data from the Slovenian Environment Agency. In our analysis, we have come to the conclusion, that elevated concentrations are occurring mainly during the winter in large urban areas due to residential combustion and because of traffic in the morning and evening peak hours and weather conditions such as temperature inversion.