To get your air clean and purified, you could always get some high-tech purifier that has fancy filters and fans and the like, but that doesn't seem all that natural. You should eschew the fancy-pants high technology and go with nature's air purifiers: plants.

OK, OK, so I don't really want you to ditch the high tech stuff, but you should use plants instead of synthetic filters. Just take a gander at this Bel-Air indoor air filtration system. It runs air through a plants leaves and roots to clean it off before pumping it back into your room. And because there are no filters, you don't need to constantly buy and change the filters in the thing. Just turn it on, let it run, and taste the goodness of nature in your lungs.

Core77, via Geekologie