INFOGRAPHIC: Top 18 houseplants for purifying the air you breathe, according to NASA
18 Houseplants That Clean The Air (NASA Says So) — Seattle's Favorite Garden Store Since 1924 - Swansons Nursery
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NASA Clean Air Study - Wikipedia
12 NASA-Approved Houseplants for Improving Indoor Air Quality « The Secret Yumiverse :: WonderHowTo
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