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The main air pollutants in the urban areas are power stations and transport. As a result of fuel combustion, heavy metals and solid particles with unknown composition enter the atmosphere. Concentrations of heavy metals in the snow can be an indicator of air pollution in urban areas, also giving us indications on the origin of pollution. Heavy metals accumulated in the snow in significant quantities in the cold period. But in the spring, runoff after the melting of snow presents a significant source of pollution i...