During the past decades, heavy metal pollution in urban soil from industrial activities and its impact on human health has been becoming one of the most important environmental problems in Ulaanbaatar Mongolia. The average concentrations of Cr, Ni, Pb, Zn, Cu and As were 1986.9, 110.5, 111.0, 110.5, 53.5, 16.4 mg/kg, respectively in study area. Heavy metal contamination can occur when soil particles are swept away from the initial pollution areas by the wind. Therefore, it is necessary to take measures to reduce soil pollution and encourage phytoremediation. A phytoremediation trial was made to study the use of Sunflower (Helianthus annuus) plant species to extract Cr out of contaminated soils. Plant species tested in this study namely Sunflower (Helianthus annuus) were grown on two different polluted soil types (Technogen sandy soil, accumulated with contaminated sludge for more than 30 years and subjected to effluent leather processing factories for more than 50 years) in a complete randomized block experimental design. Calculation of recovery percentage based on Cr removed from the soil by whole plant after cultivation ranged between 39.1 to 40.5% of total initial Cr, respectively. However, the percentage of Cr removed by plant shoots from the total Cr -removed by whole plant varied between and 37.9 to 32.8% of the removed Cr, respectively. As expected plant roots exhibited higher Cr accumulation than in shoots by 1.7–2.34 folds, respectively. It is worth to mention, that roots tend to accumulate 64.8 to 67.2% of Cr accumulated in plant biomass respectively .
