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Most people assume the air they are breathing in their house is clean. Indeed, there is no way to really tell if you are breathing in fresh oxygen or not. Well, until now. The Green Ring Air Detector will let you know just how filthy the air floating around your abode really is.

Designed by Park Jun Seok, the Green Ring Air Detector resembles the cross-section of a tree and illuminates with red or green LEDs, green being good and red being bad. The double meaning here is to not just make sure your house is pollutant free, but to also make people aware of the pollution present every day in the environment. Pretty nifty little device.