City Cleaner / concept aerial train

In many heavy industrial cities,air pollution is serious, which leads to frequent haze. The deterioration of the environment has caused great troubles for peoples' health and travel. Aiming at the problem of air pollution, a concept aerial train design with urban purification function is put forward.
The aerial train is equivalent to a large air cleaner, shuttling in the city. The cleaning principle is using the replaceable HEPA screen to filter and absorb air pollutants, to achieve the purpose of purifying the air. In order to save energy, turn on the purification function regularly for the period with poor air quality.