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At present, the most environmentally friendly means of transportation in the city is bicycle. We designed this bike to drive the air purification device at the rear of the bike through the power brought by the pedal during the cycling process. During the cycling process, the polluted air inhaled is purified and fresh and healthy air is discharged in the way of exhaust emission. Riders only need to register on the relevant APP and do not need to pay for the ride. Cyclists clean the air to offset the cost of cycling, encouraging more people to participate in environmental protection and purification.