Mann-Hummel's three-layer cabin air filter using polyphenol, a natural plant extract, locks allergy causing particles (allergens) and prevents them from entering the vehicle. The cabin air filter introduces a three-layer technology. The first layer consists of a polyphenol coating that locks many allergy-causing allergens. The second is a charcoal layer with activated carbon. This layer adsorbs odor and toxic exhaust gas. The third layer, the dust layer, consists of non-woven material with an anti-microbial function that removes fine dust and particles. The anti-microbial function prevents bacteria and mold growth. The non-woven filter media can filter particles smaller than 5 μm.