Activated Charcoal is one of the eco-friendliest natural odor absorbers. It cleans the air naturally, absorbing odors and excess moisture. It also prevents the formation of mold, mildew, and bacteria by absorbing excess moisture and acts as an air purifier as well. To keep your surroundings smelling clean and fresh. These odor eliminating bags are made with 100% activated bamboo charcoal and cover 90 square feet. Lasts up to 2 years. Place in direct sunlight for 1hr per month to renew the odor eliminator power.