The anthropogenic pollutants in urban ponds based on the example of Słupsk Józef Piotr Antonowicz, Damian Panasiuk, Sylwia Machula, Jacek Florian Kubiak and Magdalena Opalińska E3S Web Conf., 45 (2018) 00004 Published online: 30 July 2018 DOI: 10.1051/e3sconf/20184500004