The authors investigated the composition and quantitative indices of c
ommunities of soil algae in the territory of various industrial enterp
rises in Ekaterinburg. It war. shown that in conditions of strong poll
ution with heavy metals and acids communities are formed with a predom
inance of green algae. In the care of pollution with organic substance
s and alkalization of the soil, blue-green algae predominate in the al
gae groupings.