Clear Air uses Activated Bamboo Charcoal to naturally absorb odors, allergens & bacteria from the air. It uses zero harmful chemicals or toxins like other air fresheners. The extremely porous makeup of the Bamboo Charcoal allows it to collect odor causing elements in the air and soak them up. Once a month the bag should be placed into the sun where the built up odors will be released and Clear Air will be as good as new.