Being the inhabitants of all parts of the environment (water, air, soil) plants can very precisely point to the ecological conditions of the environment. Vascular plants are often used for biomonitoring of heavy metals. The analyses are most often performed on plant leaves. The results of this research clearly indicate that pollution with lead on the locations of Avala (locations 1, 2 and 3), although being of an anthropogenic origin, do not result only from traffic, while on location 4 due to the frequency of traffic, the greatest agent of lead pollution is traffic. The accumulation of heavy metals in plants in higher concentrations indicates the relative increase and pollution spread all over the habitat.
Key words: Protected natural resource, belgrade, plants, lead concentrations.
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