Which plants are natural indoor deodorizers?

THINKING GREEN Whether or not you add houseplants to your healthy house depends on your own sensitivities. On the plus side, houseplants may actually improve your indoor air quality by acting as natural filters for some pollutants. On the negative side, plants may add to indoor air pollution by adding to a home's humidity levels and providing a breeding ground for mold and other biological organisms. While researching natural indoor air filters for space habitation, the National Aeronautics and Space Administration (NASA) discovered that some plants are more effective than others at filtering certain pollutants.