Do houseplants actually improve indoor air quality?

FAQ
Question: 

Do houseplants actually improve indoor air quality?

Answer: 

Houseplants are attractive additions to homes and offices.  They can also improve indoor air quality by removing formaldehyde, benzene, xylene, ammonia, and other harmful chemicals.  Plants that have been shown to improve indoor air quality include Chinese evergreen (Aglaonema spp.), umbrella tree or schefflera (Schefflera spp.), spider plant (Chlorophytum comosum), dumbcane (Dieffenbachia spp.), corn plant (Dracaena fragrans), pothos (Epipremnum aureum), weeping fig (Ficus benjamina), rubber tree (Ficus elastica), English ivy (Hedera helix), philodendron (Philodendron spp.), snake plant (Sansevieria trifasciata), peace lily (Spathiphyllum spp.), arrowhead vine (Syngonium podophyllum), and palms (various species).  

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