According to a study conducted by NASA and the Professional Landcare Network, indoor plants absorb CO2, release Oxygen, and remove polutants from the air inside homes and offices. Carpeting, paints, and cleaning products can all contain volatile organic compounds (VOC's) that can cause allergic reactions or even lead to cancer. Although paints and household cleaners without VOC's are now available, many of us do not use or have them. And if your home is older, chances are that your indoor air contains these VOC's.
To improve your indoor air quality, NASA recommends an indoor plant for every 50 feet of space.