The outside air that enters the passenger compartment through the ventilation system contains a wide range of substances that are harmful to health, such as fine dust or allergens. Cabin air filters from MANN+HUMMEL efficiently clean the intake air thanks to their multi-layer structure and an optional biofunctional coating, thus reliably protecting the vehicle occupants. MANN+HUMMEL also offers switchable and multi-stage cabin air filter systems which ensure optimum air quality in the cabin in all ambient situations, while at the same time reducing energy consumption and increasing the service life of the filters.