China's neck-breaking economic growth comes with a price: massive environmental problems. With pollution in Beijing being at an all times high, the solution for some people has been to build their own air filtering systems using a commonly available box fan, a hepa filter, some hacking and a strap.
Combined with a basic household fan, a simple HEPA filteris all you need to remove more than 90% of the PM2.5 in your room.We were kind of surprised too.
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