Each improperly located and/or operated landfill affects the environment, polluting soil, surface, groundwater, atmospheric air and, as a consequence of pollution transport, also remote agricultural, urban and recreational areas. In addition, factors affecting the environmental impact of landfills include storage technology, preparation of areas for landfill, sealing of the landfill and technical infrastructure. Over time, landfills can become active sources of emissions of these microorganisms, spreading them over many kilometers. The aim of the conducted research was to estimate, based on results of microbiological tests, the impact of the municipal landfill on the revitalized area of the inactive Hard Coal Mine in Brzeszcze. The results of research by domestic and foreign authors indicate that the atmospheric environment in the vicinity of municipal landfills is characterized by the occurrence of different concentrations of bacterial aerosol. This is related to the size of the landfill area, its nature and the topography of the site.