## 2 Materials and Methods  
### Soil and Fungi Sampling  
Six small sampling areas were chosen within the area of Litvinov city. The sampling points were selected to cover green zones popular for the inhabitants across the whole city. The schematic map of the position of the individual points is presented in Supplementary Figure S1. At each sampling area, five sub-samples taken from the 0 to 25 cm soil layer were randomly collected from an area of ca. 10 m\({}^{2}\). The soils were placed into plastic bags and transported immediately to the laboratory. The samples were frozen at -20 \({}^{\circ}\)C, freeze-dried, ground in a mortar, and passed through a 2 mm stainless steel sieve before analysis.  
The individual sampling areas can be characterized as follows:  
\"Mine Pavel\" is a gardening colony that was built near the abandoned underground coal mine of the same name. Here, soil samples were taken in a wooded area adjacent to the colony and on the bank of a stream that flows through the colony (50.6016419\({}^{\circ}\) N, 13.6296958\({}^{\circ}\) E).  
\"Chuderin\" is a part of the city of Litvinov, where the soil samples were taken from the meadow, which is located between the playground in Chudefinska Street and the gardening colony (50.5950861\({}^{\circ}\) N, 13.5961450\({}^{\circ}\) E).  
\"Nova Voda\" is an artificial lake that was created as a result of former mining activity and is also located in the Chuderin section on the edge of the Nove Zaluzi Park, near Podkrusnohorska and Havriska streets. The soil was collected in the forest on the bank of this reservoir (50.5925142\({}^{\circ}\) N, 13.5847122\({}^{\circ}\) E).  
\"Nova Voda meadow\" is the designation for the sampling point on the shore of the Nova Voda reservoir but outside the forest cover (50.5932992\({}^{\circ}\) N, 13.5870508\({}^{\circ}\) E).  
\"Viewpoint\" is a well-known place called Czedik's Gloriette. Soil samples were taken in the forest along the forest path that leads to this place from Czedikova Street (50.6059033\({}^{\circ}\) N, 13.6118442\({}^{\circ}\) E).  
\"Park\" is the designation for collection points in the well-known Voigtovy Sady Park, which is located in the city center behind the church of St. [PERSON] among Kostelni, Zahradni, and Smetanova Streets (50.5998925\({}^{\circ}\) N, 13.6131103\({}^{\circ}\) E).  
At these locations, representative samples of all the fruiting bodies of the saprotrophic and mycorrhizal fungi were present in these areas within the main season of 2023 (between August and November 2023). The fruiting bodies were sampled at the areas of soil sampling; the whole fruiting bodies were cleaned, separated according to their species, stored in paper bags, and transported to the laboratory. The samples were freeze-dried, homogenized in a mortar, and stored in the freezer. In total, 69 species representing 12 families were identified and sampled. The highest number of species belonged to the family Agaricaceae (10 species), followed by Mycenaceae (9 species) and Pathyrrellaceae (7 species). The families Inocybaceae and Tricholomataceae were represented by 6 species, Russulaceae by 5 species, Strophiiaceae by 4 species, Omphalotaceae, Physalaciaceae, and Boletaceae by 3 species, and Paxillaceae, Marasmiaaceae, and Amanitaceae by 2 species. Only one species was found for the families of Hymenopteraae, Sclerodermaaceae, Clavulinaceae, Pluteaceae, Cyphellaceae, Cortinariaceae, and Gombaceae. The complete list of the species found at the individual sampling sites is presented in Supplementary Table S1. For the determination of PAHs, only the species with more than 5 fruiting bodies found at the particular site were chosen, i.e., species representing Agaricaceae, Boletaceae, Cortinariaceae, Gombaceae, Physalatiaceae, Pathyrrellaceae, and Russulaceae.