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NASA Clean Air Study

From Wikipedia, the free encyclopedia

The NASA Clean Air Study[1] was 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,[2][3][4] 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 lists are from B. C. Wolverton's book[5] and paper[6] 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 more recent 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.[7]

YouTube Encyclopedic

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  • A NASA study explains how to purify air with house plants
  • Best Air-Filtering Plants, According to NASA
  • 28 Best Air Purifying Plants ( For indoor / Outdoor ) Classified to NASA
  • Best Air Filtering House Plants, According To Nasa
  • NASA Clean Air Study Urdu Hindi


You’ve probably heard plants can improve your air quality. Just about every paper on the subject, [and I mean literally all of them,] are based on a 1989 NASA study and a follow up by the lead scientist. The scientists collected plants and put them in chambers, then pumped in harmful chemicals like these: After 24 hours, they tested the air quality in each chamber. Some plants were able to remove up to 90% of the harmful chemicals. So which plants were the most effective? NASA scientists tested familiar ones. “All the plants they have in their list are just very common house plants. This is Dr Dennis Stevenson, Vice President for science at the New York Botanical Garden. "I think they picked them because they were looking at things that people would have in their environments. As opposed to some exotic, weird tropical plant that nobody knows anything about.” All of these plants are excellent at getting rid of harmful indoor carcinogens. Here’s how it works: Plants take in the harmful gasses out of the atmosphere and sequester them in their roots and cells. Some of these chemicals are broken down by fungi in the soil and others are stored in the plant. So what about things like...smoke, that might be in your apartment via cigarettes. Or you know...other types of smoke. “Well I would say, they take up stuff in the atmosphere so theoretically they should take up any kind of smoke that’s in your apartment in a certain sense, right. I don’t really know, but I think if one did those tests that probably one would find a positive correlation with that.” Of all of the plants NASA mentioned in its study these three have the best surface area to chemical removal ratio. But keep in mind that a gerbera daisy will never get as big as a lady palm, and the more plant you have, the more harmful chemicals that you can remove. “ A big leaf plant is probably, potentially able to exchange more things with the air you know than something with little needle leaves.” And for those lacking a green thumb? “I'll tell you, the one in there that’s probably the hardest to kill is the sansevieria, the mother in law’s tongue.” It scores high on removing chemicals and only needs low light. Hello everyone, if you’d like to learn more about the plants or the experiments done by NASA, check out the description below. You’ll find a more detailed account of which plants are mentioned at the beginning of the video. If you’re looking to buy some of these plants or want to learn how to take care of them, don’t forget to check out your local nursery.


Chart of air-filtering plants

 One of the plants in this study is the Flamingo Flower.
One of the plants in this study is the Flamingo Flower.
Plant, removes: benzene[2] Total µg/h of benzene removed[2] formaldehyde[2][5][6] Total µg/h of formaldehyde removed[2][6] trichloroethylene[2] Total µg/h of trichloroethylene removed[2] xylene and toluene[6] ammonia[6] Toxic to dogs, cats[8]
Dwarf date palm (Phoenix roebelenii) No Yes[5] 1,385[6] No Yes No non-toxic[9]
Areca palm (Dypsis lutescens) No Yes[5] No Yes No non-toxic[10]
Boston fern (Nephrolepis exaltata 'Bostoniensis') No Yes[5] 1,863[6] No Yes No non-toxic[11]
Kimberley queen fern (Nephrolepis obliterata) No Yes[5] 1,328[6] No Yes No non-toxic[12]
English ivy (Hedera helix) Yes 579 Yes[5] 402[2] -1,120[6] Yes 298 Yes No toxic[13]
Spider plant (Chlorophytum comosum) No Yes[2] 560[6] No Yes No non-toxic[14]
Devil's ivy, Pothos plant (Epipremnum aureum) Yes Yes[2] No Yes No toxic[15]
Peace lily (Spathiphyllum 'Mauna Loa') Yes 1,725 Yes[5] 674[2] Yes 1,128 Yes Yes toxic[16]
Flamingo lily (Anthurium andraeanum) No Yes No Yes Yes toxic[17]
Chinese evergreen (Aglaonema modestum) Yes[5][18] 604 Yes[5][18] 183[4] No No No toxic[19]
Bamboo palm (Chamaedorea seifrizii) Yes 1,420 Yes[2][5] 3,196[2] Yes 688 Yes No non-toxic[20]
Variegated snake plant, mother-in-law's tongue (Sansevieria trifasciata 'Laurentii') Yes[5] 1196[4] Yes[2] 1,304[2] Yes[5] 405 Yes No toxic[21]
Heartleaf philodendron (Philodendron cordatum) No Yes[2] 353[2] No No No toxic[22]
Selloum philodendron
(Philodendron bipinnatifidum)
No Yes[2] 361[2] No No No toxic[citation needed]
Elephant ear philodendron (Philodendron domesticum) No Yes[2] 416[2] No No No toxic[citation needed]
Red-edged dracaena (Dracaena marginata) Yes 1,264 Yes[2] 853[2] Yes 1,137 Yes No toxic[23]
Cornstalk dracaena (Dracaena fragrans 'Massangeana') Yes Yes[2] 938[6] Yes 421 No No toxic[23]
Weeping fig (Ficus benjamina)[24] No Yes[5] 940[6] No Yes No toxic[25]
Barberton daisy (Gerbera jamesonii) Yes 4,486 Yes[5] Yes 1,622 No No non-toxic[26]
Florist's chrysanthemum (Chrysanthemum morifolium) Yes 3,205 Yes[2][5] 1,450[6] Yes Yes Yes toxic[27]
Rubber plant (Ficus elastica) No Yes[5] No No No toxic[28]
Dendrobium orchids (Dendrobium spp.) No No No Yes No non-toxic[citation needed]
Dumb canes (Dieffenbachia spp.) No No No Yes No toxic[29]
King of hearts (Homalomena wallisii) No No No Yes No toxic
Moth orchids (Phalaenopsis spp.) No No No Yes No non-toxic[30]
Aloe vera (Aloe vera) Yes[31] Yes[1] 65[2] No No No toxic[32]
Janet Craig (Dracaena deremensis "Janet Craig") Yes[1] 1,082 Yes[1] 1,361[6] - 2,037[2] Yes[1] 764 No No toxic[33]
Warneckei (Dracaena deremensis "Warneckei") Yes[1] 1,630 Yes[1] 760[6] Yes[1] 573 No No toxic[33]
Banana (Musa Oriana) No Yes[1] 488[2] No No No non-toxic[34]


Most of the plants on the list originated 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.

See also


  1. ^ a b c d e f g h i BC Wolverton; WL Douglas; K Bounds (July 1989). A study of interior landscape plants for indoor air pollution abatement (Report). NASA. NASA-TM-108061. 
  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab Pottorff, L. Plants "Clean" Air Inside Our Homes. Colorado State University & Denver County Extension Master Gardener. 2010.
  3. ^ Wolverton, B. C., et al. (1984). Foliage plants for removing indoor air pollutants from energy-efficient homes. Economic Botany 38(2), 224-28.
  4. ^ a b c Wolverton, B. C., et al. A study of interior landscape plants for indoor air pollution abatement: an interim report. NASA. September, 1989.
  5. ^ a b c d e f g h i j k l m n o p q Wolverton, B. C. (1996) How to Grow Fresh Air. New York: Penguin Books.
  6. ^ a b c d e f g h i j k l m n o Wolverton, B. C. and J. D. Wolverton. (1993). Plants and soil microorganisms: removal of formaldehyde, xylene, and ammonia from the indoor environment. Journal of the Mississippi Academy of Sciences 38(2), 11-15.
  7. ^ Orwell, R.; Wood, R.; Tarran, J.; Torpy, F.; Burchett, M. (2004). "Removal of Benzene by the Indoor Plant/Substrate Microcosm and Implications for Air Quality". Water, Air, & Soil Pollution. 157 (1–4): 193–207. doi:10.1023/B:WATE.0000038896.55713.5b. 
  8. ^ ASPCA
  9. ^ ASPCA
  10. ^ ASPCA
  11. ^ ASPCA
  12. ^ ASPCA
  13. ^ ASPCA
  14. ^ ASPCA
  15. ^ ASPCA
  16. ^ ASPCA
  17. ^ ASPCA
  18. ^ a b Wolverton, B. C., et al. Interior landscape plants for indoor air pollution abatement: final report. NASA. September, 1989. pp 11-12.
  19. ^ ASPCA
  20. ^ ASPCA
  21. ^ ASPCA
  22. ^ ASPCA
  23. ^ a b ASPCA
  24. ^ American Society for Horticultural Science. Indoor plants can reduce formaldehyde levels. ScienceDaily. February 20, 2009. Quote: "...Complete plants removed approximately 80% of the formaldehyde within 4 hours. Control chambers pumped with the same amount of formaldehyde, but not containing any plant parts, decreased by 7.3% during the day and 6.9% overnight within 5 hours..." In reference to: Kim, J. K., et al. (2008). Efficiency of volatile formaldehyde removal by indoor plants: contribution of aerial plant parts versus the root zone. Horticultural Science 133: 479-627.
  25. ^ ASPCA
  26. ^ ASPCA
  27. ^ ASPCA
  28. ^ "Safe and Poisonous Garden Plants: Toxic Plants (by scientific name)". University of California. Division of Agriculture and Natural Resources, University of California. Retrieved 2017-01-04. 
  29. ^ ASPCA
  30. ^ ASPCA
  31. ^ "15 houseplants for improving indoor air quality". MNN - Mother Nature Network. Retrieved 2016-01-04. 
  32. ^ ASPCA
  33. ^ a b ASPCA
  34. ^ ASPCA

External links

This page was last edited on 22 January 2018, at 06:00.
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