Air pollution occurs when harmful or excessive quantities of substances including gases, particulates, and biological molecules are introduced into Earth’s atmosphere. Particles smaller than 10 micrometers in diameter (about the width of a cotton fiber) are tiny enough to inhale and can be harmful to the heart and lungs. Inorder to curb its widespread, China had built its own Air Purifier to battle smog. It is said to be the world’s largest air purifier with a capacity to purify “Million Cubic Feet of Air an Hour”.
The project’s lead researcher, Cao Junji, said that since it began operating, the tower has produced more than 353 cubic feet of clean air a day and that air quality for nearly four square miles around the tower has noticeably improved. The project consists of two parts. First, a seven-metre-tall tower sucks up polluted air, and cleans it at a nano-level. Second, the carbon from smog particles is turned into diamonds.
Scientists at China’s Institute of Earth Environment have invented and constructed a way what they call is the world’s largest air purifier in the northern city of Xian. The experimental smog-sucking tower stands at over 100 metres tall and is designed to improve air quality in the city, where standards regularly fall short of expectations set by the World Health Organization. According to the operators, the air quality has seen improvement in an area of 10 square kilometres over the past few months and the tower has produced more than 10 million cubic metres of clean air. The large air purifier is able to reduce the smog to moderate level on severely polluted days.
How does the Air Purifier work
Polluted air is cleansed by ionizing airborne smog particles. A radial ventilation system at the top of the tower (powered by wind energy) draws in dirty air, which enters a chamber where particles smaller than 15 micrometers are given a positive charge. Like iron shavings drawn to a magnet, the the positively charged particles attach themselves to a grounded counter electrode in the chamber. The clean air is then expelled through vents in the lower part of the tower, surrounding the structure in a bubble of clean air.
The cylindrical white tower is only one part of what’s being claimed as the world’s largest air purification system. At the tower’s base, there is also a large network of greenhouses. Polluted air is brought into these glass rooms where it’s heated by trapped solar energy. The hot air naturally rises, moving upwards through the tower’s many sets of cleaning filters.
It is run by the Institute of Earth Environment at the Chinese Academy of Sciences, the tower and its effects are being closely monitored. Across the world, air pollution is the single biggest health risk to city-dwellers. This massive air purifier system is China’s latest effort in curbing its smog problem.