China Builds 'World's Biggest Air Purifier' That Actually Works
mardi 16 janvier 2018, 23:50 , par Slashdot
The South China Morning Post shares an update on the status of an experimental tower in northern China, dubbed the world's biggest air purifier by its operators. According to the scientist leading the project, the tower -- which stands over 328 feet (100 meters) tall -- has brought a noticeable improvement in air quality. From the report: The head of the research, Cao Junji, said improvements in air quality had been observed over an area of 10 square kilometers (3.86 square miles) in the city over the past few months and the tower has managed to produce more than 10 million cubic meters (353 million cubic feet) of clean air a day since its launch. Cao added that on severely polluted days the tower was able to reduce smog close to moderate levels. 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. The average reduction in PM2.5 -- the fine particles in smog deemed most harmful to health -- fell 15 per cent during heavy pollution. Cao said the results were preliminary because the experiment is still ongoing. The team plans to release more detailed data in March with a full scientific assessment of the facility's overall performance.
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