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“NASA environmental research has led to a plant-based air filtering system. Dr. B.C. Wolverton, a former NASA engineer who developed a biological filtering system for space life support, served as a consultant to Terra Firma Environmental.”
- “Aquatic plants and wastewater treatment (an overview)” > http://ntrs.nasa.gov/search.jsp?R=822211&id=1&qs=No%3D30%26Ntt%3Dwolverton%26Ntk%3Dall%26Ntx%3Dmode%2520matchall%26N%3D0%26Ns%3DHarvestDate%257c1
“Plants that top the clean-air list include peace lily, bamboo palm, English ivy, mums, and gerbera daisies” http://www.treehugger.com/files/2007/12/belair_filterin_1.php