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Taipei City is one of the large cities in the world located in Taiwan. There are high density of population and motor vehicles especially motorcycle to pollute the air of Taipei city. The air pollution in Taipei City is very serious. Meanwhile, Taipei also has high density and complex subway system to transport people to every corner of the city quickly. There are tens of thousands air vents on the ground connected to the tunnel of subway scattered in every corner of the city. The idea is come from that the use of subway airstream by installing an air filter set to the vent can filter the particles of air without the use of electricity.
Tainan University of Technology