The present invention relates to an air filter for a ventilation system of a vehicle, and the main object of the invention is to provide a secondary filter made of adsorbed activated carbon material, but when harmful gases are collected through fine pores by coating a catalytic element, noxious gases It is intended to be able to fundamentally solve a chemical reaction with the field so that harmful components cannot be released again. A characteristic configuration of the present invention to achieve the above object is a primary filter layer (1) for filtering out dust and foreign matter having a size of about 1 μm or more in the air, and odor and human body having a size of about 1 μm or less. In the air filter for a ventilation system of a vehicle comprising a secondary filtration layer (2) for filtering out harmful gases, the secondary filtration layer (2) of the air filter is made of adsorption activated carbon (21) having a large number of micropores. , By dipping the adsorption activated carbon by making the catalyst material into a slurry state in the micropores therein, or by coating the catalyst material by chemical vapor deposition, the catalytic elements of this catalyst material are in contact with harmful gases to the human body. It is intended to be able to remove harmful components by reaction.
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