“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.”
“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
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