The influence of temperature inversions on the air pollution in the city of Sibiu. The temperature inversions are likely to occur in Sibiu area due to its position inside a depression of contact between the Southern Carpathians and the Transylvanian Plateau. The effects of these inversions involve not only very low temperatures but also a stable air stratification that does not allow convective air movements; that increases air pollution in the city. The aim of this research is to identify the level of air pollution in days with temperature inversions. There were analysed the daily medium concentrations of the following atmospheric pollutants: sulfur dioxide SO2, nitrogen dioxide NO2, carbon monoxide CO and ozone O3, in days with or without inversions. The concentration of two of the above mentioned pollutants is maximum in days with general temperature inversions, high atmospheric pressure and slow wind speed.