China built the biggest air purifier in the world

The 100-meter high purification tower in Xian is said to cover an area of 10 square kilometers.

By the cutting down a large no. of the trees is raising an environmental problem in the world.And with the rising of industrialization and population the need of fresh air is also increasing.
Now many rules and regulations have been implemented on the saving of forests.But the damage is already done.
So to cope with the problem China has came up with a solution.building the world's largest air purifier

China's latest attempt to mitigate some of its air pollution is an experimental air purification tower standing 100 meters high, located in Xian in the north central part of the country, and preliminary tests indicate that it can improve air quality over an area some 10 square kilometers in size.

The smog tower, which is a project of the Chinese Academy of Sciences, isn't a power hog, either, thanks to the design that uses large greenhouses at the base of it to heat incoming air with solar energy so that it rises passively through the tower's multiple filters before exiting the top much cleaner than before.

The tower, which was completed last year, is said to produce about 10 million cubic meters (353 million cubic feet) of clean air per day, with an average reduction in PM 2.5 (fine particulate matter measuring 2.5 microns or less in width) of 15% in local air during periods of heavy pollution

If the testing results continue to bear out over time, the Academy group behind the smog tower hopes to build a much bigger version measuring 500 meters tall and 200 meters wide, with the greenhouses feeding it covering some 30 square kilometers. It's thought that a smog tower of this size could clean the air for an entire small city.

source:https://www.treehugger.com/clean-technology/china-built-biggest-air-purifier-world.html