FIELD: gas purification. SUBSTANCE: method consists in purifying off-gases with filter material with microorganisms fixed on its surface. Filter material is preliminarily treated with aqueous solution containing 0.5-1.0 g/l of non-ionic surfactant at 15-25 C under atmospheric pressure for 0.5-1.0 h, whereupon microorganisms are applied. Off- gases, prior to be brought in contact with biofilter, are saturated with water. EFFECT: enhanced efficiency of process. 2 tbl
