MEYLE cabin air filters prevent airborne pollutants from entering the passenger compartment. Failure to replace the filters regularly may cause the filter elements to clog. The consequence: While overall airflow is limited, insufficiently cleaned air fills the vehicle cabin. As smog and smog-related health effects are becoming increasingly serious, regular replacement of the cabin air filters is all the more important. There are two factors determining filtering performance: accuracy of fit and quality of the filtration medium.