Having breathed enough of the poisoned air during the formation of the industry, now the inhabitants of the Celestial Empire do not spare funds for innovative projects to improve the environment. Recently in Xi'an, a $ 2 million hybrid smog absorption unit reached its design capacity. It occupies 10 sq. M. km of area and consists of a huge pipe and an array of solar collectors.
The main advantage of the Xi'an anti-smog prototype is that it operates in a passive mode. A huge array of glass roofs on the ground serves to capture sunlight, which heats the air and rushes upward by gravity - into a pipe 18 m high. In the pipe, gases pass through a series of filters, so that conditionally clean air enters the atmosphere.
Conditionally - because the official data on the filtering results has not yet been published. The installation began operation in January 2018, it passes 5-8 million m 3 air per day and at the peak of pollution in winter heating periods showed stable operation. Indirect data from pollution sensors in neighboring areas indicate a decrease in the concentration of particulate matter in the air by 19% in the last months of winter. It sounds interesting, but this is a very low figure if you evaluate the economic benefits of the project.
Experts have many questions to the creators of Xi'an anti-smog - in particular, they are interested in the ability to purify the air from sulfur dioxide and the effect of such a "vacuum cleaner" on the environment and the movement of air masses in the city. To normalize the ecology in Xi'an, at least a dozen of such towers are needed, but their construction will be too expensive even without taking into account the allocation of huge useful areas of land. Therefore, the project is still at the experimental stage.