Heavy metals in snow cover and urban soils

The pollution of snow cover and soils of different functional zones of the city of Kirov with heavy metals (HM) has been assessed. Judging by the state of the snow cover, the level of air pollution with Zn, Cu, Pb, Ni, Cd in winter in different functional zones of the northern part of the city and in the background territory differs slightly, but varies significantly over the years of observation. A correlation was found (r = 0.98-0.99) between the content of HMs in the snow cover and their total content in the soil. It is shown that the level of soil pollution depends on the selected background indicators. In the absence of excess of gross forms of HM over approximate permissible concentrations, the indicator of total pollution (Z(c)) corresponds to the average level of soil pollution in the industrial zone. Pollution is diagnosed by the accumulation of mobile HM compounds, and the mobility coefficients (indicators that do not depend on the selected background) make it possible to assess the risk of accumulation of Pb and Cd in soils in exchangeable and carbonate-related forms in the industrial, as well as in the recreational areas of the northern part of the city, as very high.