NASA Clean Air Study

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The NASA Clean Air Study[1] has been led by the National Aeronautics and Space Administration (NASA) in association with the Associated Landscape Contractors of America (ALCA). Its results suggest that certain common indoor plants may provide a natural way of removing toxic agents such as benzene, formaldehyde and trichloroethylene from the air, helping neutralize the effects of sick building syndrome.
The first list of air-filtering plants was compiled by NASA as part of a clean air study published in 1989. which researched ways to clean air in space stations. As well as absorbing carbon dioxide and releasing oxygen, as all plants do, these plants also eliminate significant amounts of benzene, formaldehyde and trichloroethylene. The second and third list are from B. C. Wolverton's book and paper and focus on removal of specific chemicals.
NASA researchers suggest efficient air cleaning is accomplished with at least one plant per 100 square feet of home or office space. Other research has shown that micro-organisms in the potting mix (soil) of a potted plant remove benzene from the air, and that some plant species also contribute to removing benzene.

Chart of air-filtering plants

Plant, removes:benzene[2]formaldehyde[2][5]trichloroethylene[2]xylene and toluene[6]ammonia[6]
Dwarf date palm (Phoenix roebelenii)noYes[5]noYesno
Areca palm (Dypsis lutescens)nononoYesno
Boston fern (Nephrolepis exaltata 'Bostoniensis')noYes[5]noYesno
Kimberly queen fern (Nephrolepis obliterata)noYes[5]noYesno
English ivy (Hedera helix)YesYes[5]YesYesno
Lilyturf (Liriope spicata)noYesnoYesYes
Spider plant (Chlorophytum comosum)noYes[2]noYesno
Devil's ivy, Money plant (Epipremnum aureum)YesYes[2]noYesno
Peace lily (Spathiphyllum 'Mauna Loa')YesYes[5]YesYesYes
Flamingo lily (Anthurium andraeanum)noYesnoYesYes
Chinese evergreen (Aglaonema modestum)Yes[5][8]Yes[5][8]nonono
Bamboo palm (Chamaedorea seifrizii)noYes[2][5]noYesno
Broadleaf lady palm (Rhapis excelsa)noYesnoYesYes
Variegated snake plant, mother-in-law's tongue (Sansevieria trifasciata 'Laurentii')Yes[5]Yes[2]Yes[5]Yesno
Heartleaf philodendron (Philodendron cordatum)noYes[2]nonono
Selloum philodendron
(Philodendron bipinnatifidum)
Elephant ear philodendron (Philodendron domesticum)noYes[2]nonono
Red-edged dracaena (Dracaena marginata)YesYes[2]YesYesno
Cornstalk dracaena (Dracaena fragrans 'Massangeana')YesYes[2]Yesnono
Weeping fig (Ficus benjamina)[9]noYes[5]noYesno
Barberton daisy (Gerbera jamesonii)YesYes[5]Yesnono
Florist's chrysanthemum (Chrysanthemum morifolium)YesYes[2][5]YesYesYes
Rubber plant (Ficus elastica)noYes[5]nonono
Dendrobium orchids (Dendrobium spp.)nononoYesno
Dumb canes (Dieffenbachia spp.)nononoYesno
King of hearts (Homalomena wallisii)nononoYesno
Moth orchids (Phalaenopsis spp.)nononoYesno
Most of the plants on the list evolved in tropical or subtropical environments. Due to their ability to flourish on reduced sunlight, their leaf composition allows them to photosynthesize well in household light.

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