Automotive emissions pose a significant threat to urban air pollution. While exhaust emissions are effectively controlled using exhaust gas catalysts, activated carbon is the most common technology worldwide for evaporating fuel emissions. Active carbon-filled canisters are used to adsorb emissions of high volatile hydrocarbons in the gas tank to prevent them from entering the ambient air. The adsorbed fuel vapors are then desorbed by rearranging the can while the car is being driven. This adsorption / desorption cycle continues to allow active carbon to perform throughout the life of the vehicle.