This paper presents the results of an expert assessment of the soil cover of Nizhny Novgorod (Russia) of various degrees of transformation to determine the level of concentrations of the most mobile (water-soluble) fractions of heavy metals (zinc, cadmium, lead, and copper), as well as the total content of petroleum products, followed by the identification of the level of integral toxicity of urbanozems. The research was conducted in April 2019 based on the Ecological and Analytical Laboratory of Monitoring and Environmental Protection of Minin University. The soil cover of the park territories of 7 city districts closest to industrial zones and highway lanes was studied. The level of accumulation in the soil layer of 0-15 cm of easily mobile fractions of zinc – 0.2-2.8% of maximum permissible concentration, cadmium – 18-101% of approximate permissible concentration, lead – 3.1-8.1% of the maximum permissible concentration, and copper – 0.03-0.20% of maximum permissible concentration was established. The most common territorial variability of the element was found for zinc and copper, which, first of all, is due to the uneven contamination of the soil cover with these ecotoxicants. The effect of accumulation of water-soluble fractions of heavy metals in soils on the manifestation of their toxic properties on the territory of the Switzerland Recreation Park and Dubki Park was determined by the increased content of zinc and cadmium, and by the high content of zinc and lead on the territory of the Coulibin Park.