The air filter plays a key role in cleaning the outside air entering the vehicle interior. The driver and passengers breathe air in the vehicle that has been cleaned of pollen and other dirt and bacteria particles. This filter also absorbs moisture, which keeps the windows from fogging up. It contains baking soda and charcoal to create fresh air. With the help of this accessory, the operation of the HVAC system is improved. Therefore, the ride becomes more comfortable. Experts recommend replacing this item every 12 months or 12,000 miles.