Abstract: The air intake of a conventional automobile which is mounted in front of the windshield under the air intake cover at the rear of the hood is modified by the introduction into the duct of the air intake of a filtration pillow. The pillow is formed from a plurality of separate layers of filtration material including impregnated or particulate absorption material. The absorption material is arranged for extraction of combustion products particularly hydrocarbons, carbon monoxide, nitrogen oxides, soot and the like. The filter member can also prevent the entry of debris, leaves and the like together with the rodents or insects.