The cabin air filter cleans the air that comes into the interiorthrough the heating, ventilation and A/C system. It catches dust,pollen and other airborne material that can make riding in a carunpleasant, particularly if you have allergies or other respiratoryproblems.
Recommendations on when it should be replaced vary by manufacturer— some say every 20,000km others longer — and how often dependson how much you drive and where. Check the maintenance schedule inyour owner's manual. If you drive in heavy traffic in an urban areathat has poor air quality, you could need to replace the filterannually or even more often.
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