[Limit of biologic activity of ultraviolet radiation in large city].
D001688:Biological Products; D006801:Humans; D013472:Sunlight; D014466:Ultraviolet Rays
D001688:Biological Products
SUNLIGHT; ULTRAVIOLET RAYS
Granitsa biologicheskii aktivnoi ul'trafioletovoi radiatsii bol'shogo goroda.