when the car is running with opening air conditioning,the outside air will be into the compartment, but there are many different particles in the air, such as dust, pollen, soot, abrasive particles, ozone, odor, nitrogen oxides, sulfur dioxide, carbon dioxide, benzene and so on. if there is no cabin air filter,these particles not only make air conditioning pollution, reduce cooling system performance,and the people will have an allergic reaction, lung damage, irritation after inhale dust and harmful gases, as well as the impact of smell, all of them will affect drive safely. high-quality cabin air filter can absorb powdery particles, reduce respiratory pain, reduce irritation to allergies, for driving more comfortable, air-conditioning cooling system has also been protected.
please note that there are two kinds of cabin air filter, one is no activated carbon, the other is containing (please inquiry before buying). the cabin air filter with activated carbon get all the above functions, and the life time will be 12000 km.