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To say that the air quality in Chinese cities is bad is an understatement, as you can see below.
Statistics and image via Air Quality Index China To tackle this, the municipal government of the city of Xian (population 8.7 million), the capital of Shaanxi province, has constructed what is essentially a massive air purifier. Standing some 33 stories (100 meters) tall, the tower is currently being tested by environmental scientists from the Chinese Academy of Sciences. Here's how it works, according to the South China Morning Post:
The system works through greenhouses covering about half the size of a soccer field around the base of the tower. Polluted air is sucked into the glasshouses and heated up by solar energy. The hot air then rises through the tower and passes through multiple layers of cleaning filters.
Enter a caption (optional)Scientist Cao Junji, who heads up the research team, told the paper that "improvements in air quality had been observed over an area of 10 square kilometres (3.86 square miles) in the city over the past few months and the tower has managed to produce more than 10 million cubic metres (353 million cubic feet) of clean air a day since its launch."
Enter a caption (optional)Cao also claims that the tower "barely requires any" electricity to run during daylight hours. Like you, I'm very curious as to how this all works. With any luck we'll learn more in March, when the research team is expected to release their full report.
Enter a caption (optional)Should the findings prove positive, the plan is to start building absolutely gigantic versions of these smog towers. The research team has filed a patent application for a 164-story (500 meter) tower with a greenhouse base that covers nearly 12 square miles (30 square kilometers). A single facility of that size, they reckon, would be able to clean the air for "a small sized city."
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I’m a lapsed industrial designer. I was born in NYC and figured I’d die there, but a few years ago I abandoned New York to live on a farm in the countryside with my wife. We have six dogs.
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China Builds Experimental 33-Story Air Purification Tower That Turns Smog Into Clean Air
So this is basically a solar energy updraft tower that cleans the air at the same. Neat.
@Joshua
1. I don't think plants are involved at all. At the bottom are "glasshouses" (for heating up the air) not "greenhouses".
2. If I'm understanding your last sentence correctly, carbon capture and smog mitigation/filtration are two different things.
My understanding is that this is a basically a particulate filter, not a carbon removal system.
So little info. So many questions...
How it works: the chimney effect. It is a giant chimney with a bunch of plants and filters built in a natural heat gradient created by heating the gas below so it will rise on its own. Not much more than that and this is some amazing appropriate technology for what could be a ridiculous waste of energy like some carbon capture systems.