Best Houseplants to Improve Indoor Air Quality


Heartleaf Philodendron (Philodendron scandens ‘Oxycardium’)

Top Plants for Reducing Indoor Air Pollution

  • Bamboo Palm (Chamaedorea seifrizii)
  • Chinese Evergreen (Aglaonema modestum)
  • Dracaena (Dracaena sp.). Especially Red-Edged Dracaena (Dracaena marginata), Janet Craig (Dracaena deremensis ‘Janet Craig’), Warneckii (Dracaena deremensis ‘Warneckii’), and Corn Plant (Dracaena fragrans ‘massangeana’)
  • English Ivy (Hedera helix)
  • Ficus, or Weeping Fig (Ficus benjamina)
  • Gerbera Daisy (Gerbera jamesonii)
  • Golden Pothos (Epipiremnum aureum)
  • Peace Lily (Spathiphyllum sp.)
  • Philodendron (Philodendron sp), particularly Heartleaf (Philodendron scandens ‘oxycardium’), Selloum (Philodendron selloum), and Elephant Ear Philodendron (Philodendron domesticum)
  • Pot Mum (Chrysanthemum morifolium)
  • Snake Plant, or Mother-In-Law’s Tongue (Sansevieria trifasciata ‘Laurentii’)
  • Spider Plant (Chlorophytum comosum)

For best results, have at least one six-inch plant for every 100 square feet.


Peace Lily (Spathiphyllum sp.)

Other Benefits of Indoor Plants

Of course a home or office building cannot exactly mimic the controlled conditions of a research lab, but it is clear that having plenty of healthy houseplants leads to a healthier home. In addition to processing carbon dioxide and harmful chemicals, houseplants improve indoor air quality by:

  • Helping to maintain humidity levels: Dry indoor air is blamed for a host of respiratory problems, particularly in the winter, and plants emit water vapor during transpiration.
  • Producing negative ions: Plant leaves produce negative ions, similar to many air purifying machines. Negative ions attach themselves to (and effectively remove) particles such as dust, mold spores, bacteria, and allergens. The presence of negative ions is credited for increasing psychological health, productivity, and overall well-being.


A variegated form of English Ivy (Hedera helix)

The Other Side of the Debate

Some researchers, including the EPA Indoor Air Division, remain unconvinced that houseplants are the answer to cleaning indoor air. The reasons for their doubt include:

  • Houseplants should not be your only defense against indoor air pollution. Instead, pollution should be eliminated at its source by reducing the amount of synthetic material in your home or office, and by making sure buildings are well ventilated.
  • The average home or office building is different from a controlled research lab, so it’s difficult to determine if the results translate to the real world, or how many plants are needed to get the same effect. While no one disagrees that plants process chemicals in the air, their exact rates and effectiveness are hard to prove outside the lab setting. Some critics believe it might take hundreds of houseplants to get the same results as the NASA/ALCA study.
  • Too many plants can raise humidity levels too high, which could lead to mold and bacteria growth throughout the building. Indoor humidity levels should stay between 35%-65% to avoid turning your home into a “greenhouse.”
  • Moist soil breeds bacteria, mold, and mildew. Don’t overwater your plants, and help control mold by “mulching” your houseplants with a one-inch layer of fine gravel or other porous material.


Corn Plant (Dracaena fragrans ‘Massangeana’)

Further Information

18 COMMENTS

  1. I would like to know what can I do with my corn plants leafs are spotted, spots are turning lighter, also leafs have brown spots? Please answer

  2. I have read your article and read similar articles of the benefits of houseplants but I read few articles that these houseplants also produce VOCs, am confuse, just wondering which one is now true. Please, answer at once

  3. Hi, I have many plants in my home, how large does a plant need to be to do the job in the home, for cleaning the air. I have small and large plants in the home.

    thanks, js

  4. Rimal, and future readers,

    Many plants split up photosynthesis into two parts to conserve water: night time close most pores while stockpile CO2 in acid form, and day time open pores and finish the respiration to make sugar from CO2 + water. To read more search for CAM and C4 plants.

  5. I have the houseplants that are at the top of the article that sent me here. I have an intense red orange mold growing in them, & I only water them about once a week letting the soil conpletely dry. I have recently noticed red seed looking things in the mold & they are ending up all over the house. We also have the scary black mold on most household surfaces I’ve been trying to clean. I’d like to know, should I scrape the mold out of my plant, & will it help with our allergies, etc. from the other not so forgiving molds. Can this mold spread a visible red spore that continues to grow on other surfaces?

  6. I have a heart shaped philodendron that I purchased about a month ago. It seems to be thriving and has lots of new growth on it! However, the top of the soil keeps getting moldy?!?!?! I am not an experienced plant caregiver, but I do not water more than once a week(ish) if not longer. I have also tried re-potting and replacing the as much of the soil as I could but still the mold keeps coming back. Is this normal? Please help! It grosses me out to have mold growing in my plant but I love having the plant in the house! Any suggestions would be very much appreciated!

  7. how long does it take after place oxygenating plants in ur bedroom to start noticing a difference. i have a couple snake plants i put in today… wonder how long will it be before i notice any difference.

  8. HI MY NAME IS MARIAN AND I HAVE A HOUSE PLANT AND IT HAS LONG VINES I HAVE THEM HUNG ALL OVER MY WALLS. AND THE THING IS SOME OF THE LEAVES ARE TURNING LIKE THE ARE BURNED OR ARE DRYING OUT, CAN YOU PLEASE HELP ME WITH HOW I CAN SAVE THEM FROM DRYING OUT PLEASE? THANK YOU.

  9. Too bad only the Gerbera Daisy and Spider Plant are not toxic. Perhaps there’s a link between plant toxicity and ability to filter off-gases.

  10. Even the cleanest homes have air quality issues. Breathing particles such as bacteria, viruses, pollen, mold spores, dust mites and cigarette smoke can cause a large range of negative health outcomes. Research has shown that the indoor air quality (IAQ) can be many times worse than that of the outdoor air.

  11. I would love to know all your rec. for plants for allergies, moisture control. Air quality and smell of the air and more.
    Thank you

  12. Best house plant for humidity. I have electric heating and the lounge gets very dry.
    Can you suggest a plant to help with the humidity please.

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