Many vehicles today come with a cabin air filter that is designed to filter out dust, dirt, pollen, and other harmful contaminants from the air entering your passenger compartment. In the same way that an air conditioning filter works in a house, cabin air filters are designed to capture unwanted particles and potentially harmful contaminants before they enter the vehicle interior. The Purolator cabin air filter is made of a non-woven, uniquely engineered media that traps and retains the finest harmful dust and pollen.