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The protected natural resource Avala, is a landscape of outstanding features and is located in the territory of the city of Belgrade, the city municipality Vozdovac. To assess the ecological quality of soil on the Avala mountain a research of heavy metals contents (Pb, Ni, Fe, Zn and Mn) was performed at three different locations (location 1, 2 and 3) whereby the sampling was performed on two different depths (0-10 cm and 10-20 cm). As control location one street in the centre of the city with the heaviest traffic (location 4) was chosen. On the basis of the obtained results it can be generally concluded that the soil on Avala is well preserved which is in line with the declaration of the Avala mountain as protected area. [ABSTRACT FROM AUTHOR]