I have a peace lily (like from Hot Fuzz), which isn't mentioned in this video, but is supposed to be a good one to have for air cleaning purposes.
I only have room for one, though, so I guess I'm not doing as well as I should.
For anyone with respiratory complaints bees wax and salt crystal lamps will clean the air and charge it with negative ions.
Negative ions are for everyone. You don't have to have respiratory problems to benefit from that or clean air for that matter.
I have a south facing windows in my living room which I am slowing filling up with plants. My goal is to turn the room into a mini jungle. On the down side, I smoke, so I guess the two cancel each other out. Then again, think how much worse it would be without the plants. ;)