layers 3 and 5 consist in general of preferably air pervious textile materials which comprise or consist of polymeric synthetic preferably thermoplastic fibers this is necessary in order that the surfaces may be directly modified by plasma treatment examples of polymeric synthetic textile fibers are polyacrylic pan polyamides pa such as nylon 6 and nylon 66 polyesters pes polyolefins in particular polyethylene pe and polypropylene pp polyvinyl alcohol pvai polyvinyl chloride clf polyvinylidene chloride clf acetate ca triacetate cta aramid ar elastane el elastodiene ed fluoro ptfe rubber la carbon cf viscose cv and also mixtures of the aforementioned fiber varieties the parenthetical abbreviations are codes defined in german standard specification din 60001 4 1991 08 the supporting layers 3 and 5 may consist of the aforementioned synthetic polymeric fibrous materials or comprise these in a certain proportion as for example in the case of blend materials composed of natural and synthetic polymeric textile fibers in the case of textile materials composed of purely natural textile fibers plasma modification is made possible by prior application of a polymeric or polymerizable film as described above in a particularly preferred embodiment of the present invention 39 s adsorptive filtering material 1 at least one of the two supporting layers 3 5 is a pa pes textile sheetlike structure in particular a pa pes batt or is a sheetlike structure including pes fibers and is in particular a pes cellulose textile sheetlike structure in a preferred embodiment the supporting layer 3 or 5 which in the use state of the adsorptive filtering material 1 faces a noxiant source is preferably made oleophobic on its side 3 u2032 or 5 u2032 facing the noxiant source by plasma treatment.