Genuine OEM Audi Cabin Dust and Pollen Filter, part number 8A0819439B. This filter is responsible for purifying the air that enters the vehicle's passenger compartment, trapping dust, pollen, and other airborne particles. It is typically located within the HVAC system. Featuring a multi-layer filtration medium, it ensures clean and fresh cabin air. Using a genuine OEM filter guarantees optimal filtration efficiency and airflow, protecting occupants from allergens and maintaining HVAC system performance.