The carbon pollen filter protects from fine particles and retains noxious gases like ozone and exhaust emissions while filtering out foul-smelling gases. The air conditioning car filter reduces mist on the windshield. The activated-carbon filter protects the air conditioning system from dust and dirt. Installation is simple (Refer to the PDF instruction manual). Please use the vehicle identification to confirm compatibility with your vehicle. All restrictions must be observed. All work should only be carried out by trained specialists.