Health state of forest tree species and occurrence of selected groups of fungi and animals were investigated in surroundings of a magnesium factory in three zones of immissions load A, B, C and D (control). The average defoliation of oaks and hornbeams in the zone C confirms including these stands into the zone of the chronic damage. A significantly lower degree of damage was recorded in the zone D. The forest stands in the zones A, B and C suffer from lack of mycorrhitic symbionts. This is manifested by their unfavourable health state. The moth larvae occurred on oaks and hornbeams in all zones in the latent state. Their abundance in the zones A, B and C was higher than in the zone D. In all sampling dates, years of investigation and zones a higher reduction of the leaf area by phyllophagous insects was always recorded in hornbeams than in oaks. Higher abundance of beetles in the zones A and B than in C and D can be explicated by their higher concentration on the remnants of living branches in the basal part of the dying trees. Among the birds, the highest bioindicative value have the breeding species, in which the species number increases from the zone A to the zone D. In the zones A, B and C, the only bird species (Parus major) nested in the nest boxes.