The present invention provides a method for decontaminating a gas flow by diverting the gas flow through a biofilter and allowing a biomass adsorbed to a carrier material of the biofilter to perform one or more biodegradation processes, whereby pollutants are being degraded, thereby decontaminating the gas flow. The method is cost-effective and self-sustaining, i.e. essentially free from maintenance - e.g. in order to solve problems associated with clogging. A biofilter for performing the above-cited method is provided. The biofilter comprises a least one flow passage comprising at least one carrier material, at least one proximal opening for receiving a gaseous fluid and at least one distal opening for receiving a liquid. In operation, the gaseous fluid flows upwardly and the liquid flows downwardly. A biomass is adsorbed onto the carrier material and humidified by the liquid. The liquid and the gas flow counter currently to provide a higher filtering efficiency, i.e. transfer of one or more pollutants from the gas phase to the liquid phase and/or the biomass adsorbed onto the carrier material. The carrier material is capable of exerting a capillary force on the liquid.
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