Disclosing of such technogenic anomalies is one of most important geoecological tasks of city environment evaluation. Snow cover monitoring is one of the methods of defining ranges of such anomalies. In this sense, snow cover is a reliable indicator of pollution for it concentrates the whole volume of winter precipitation. The amount of toxic materials left in a city after snow has melt is represented by a complex of substances in snow cover and carried away by thaw waters. Thus, studies of city snow pollution turn out to be practically the only reliable source of data on further formation of geochemical anomalies in soils, waters, bottom sediments, vegetation.