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Assuring good air quality is a challenge for every big city all over the world, since air pollution poses important health risk to humans and increases with the industrialization and urbanization degree. Cluj-Napoca is a Romanian city with high population density and intense traffic, but also with moderate to high air pollution. The air pollution with metals (Cu, Cd, Co, Cr, Ni, Pb and Zn) in Cluj-Napoca city was investigated using moss bags. Polyethylene bags of 50 cm2, containing 8 g dried moss (Sphagnum, L.) co...