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You can rent a bike. When using a bicycle, kinetic energy of a wheel is changed by an electric energy. The electric energy is accumulated in the bicycles body. If you return the bike, electric energy is moving into the holder. The electrical energy is used to purifing the air. The filter absorbs the dirt. In other words... It is good for your health and the city. If cycleaners were installed throughout the city. The citys air quality would be much better than now.