Natural plants are maybe the very best and most efficient air purifier that not simply provide fresh air but beautify the interiors as well. Harnessing the natural process of air purification, David Edwards and Mathieu Lehanneur, designers from Harvard, have come up with a cool air purifier which makes use of home plants to clean air. Named Andrea, the ‘green’ air purifier absorbs toxic gases in order to filter them through the roots as well as leaves of the indoor plant within and gives clean air. What’s more, you do not need exotic home plants for this, since plants as universal as Lilly, Red-Edged Dragon Tree, Spider Plant and Aloe Vera are perfect for air purification.