

Areca Palm: This palm tree is on the larger side (the one I have in my house is about 6 feet tall) but it is a slow grower. Fantastic for the office or living room area. According to the NASA study by B.C. Wolverton, it is the one of the top-rated toxin absorber and air purifying plants out there. It is particularly effective in removing xylene (used as a solvent on leather, among other products), toulene (found in paint), and toxic gas formaldehyde (found in a multitude of products, like textiles -- formaldehyde forms formic acid in the body, which is the same stuff that many venomous insects/reptiles emit when they sting or bite). So, my fellow plant-lovers (or soon-to-be ;), if you take care of an Areca, it will take care of you!
The Rubber Plant is great because of its distinct, firm aesthetic appeal. Appreciated by architects and designers for its specific look, the Rubber Plant is excellent at removing formaldehyde and other chemical vapors from the air. It is bred for toughness and can survive in less light than most plants its size. But be careful, this it does not tolerate overwatering. It does enjoy its leaves sponged off with water occasionally, though. Depending on your pot size, rubber plants grow 2-8 feet tall.
English Ivy is a great plant with lovely leaves that can decorate nearly any area in a room, and stay small or grow full. You can take one branch from it and plant it in a little pot/cup (mine are in clear drinking glasses that I don't want to use anymore) or use a large planter to grow a full, lush plant. They are particularly effective in removing formaldehyde. The cheerful, delicate look of it really brightens a room.
The Boston Fern has been around since prehistoric times and were first popular in the Victorian age for their lush foliage. It is the best plant of those tested in the NASA study for removing air pollutants, especially formaldehyde, and also creates a valuable amount of humidity in its environment. This plant can hang or sit on a pedestal, as its leaves droop downward as it grows. Keep moist.
If you want a flowering plant that looks lovely on the desk (3 in my office) or in the house, the Peace Lily is a winner. These puppies only need to be watered about twice a week and if they get a little droopy from dehydration, they perk right back up after some watering. The Peace Lily excels in removing acetone, alcohols, trichloroethylene, benzene and formaldehyde. A gorgeous little addition to any environment!