The cabin filter, primarily used to filter the air entering the vehicle's cabin, is effective in reducing the concentration of particles in the air.  It improves the air quality inside the cabin, protecting passengers from the effects of air pollution.  This is crucial for the health of both the driver and passengers, as well as for the protection of interior components in the cabin.  These filters are typically located in the vehicle's internal air conditioning system, preventing pollutants from entering the cabin and enhancing comfort and safety for occupants.