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Breathe Easy: The Best Houseplants for Improving Air Quality

Breathe Easy: The Best Houseplants for Improving Air Quality

Indoor air quality is a topic that often goes unnoticed, yet it plays a significant role in our overall well-being. As we spend the majority of our time indoors, whether at home, in the office, or in other enclosed spaces, the air we breathe can have a profound impact on our health. Thankfully, nature has provided us with a natural solution: houseplants.


Houseplants not only add beauty and a touch of greenery to our living spaces but also possess the remarkable ability to purify the air we breathe. These air-purifying powerhouses have gained recognition, and their effectiveness has been validated by none other than NASA.

In a groundbreaking study conducted by NASA, researchers discovered that certain houseplants possess the unique ability to remove harmful pollutants from indoor air. These plants act as natural air cleaners, combating the invisible toxins that lurk within our homes and offices. The NASA study identified specific houseplants that excel at removing common pollutants such as benzene, formaldehyde, trichloroethylene, and more.


"The following plants were tested during the initial 1989 study:


Variegated snake plant / mother-in-law's tongue (Sansevieria trifasciata laurentii)

English ivy (Hedera helix)

Peace lily (Spathiphyllum 'Mauna Loa')

Chinese evergreen (Aglaonema modestum)

Bamboo palm (Chamaedorea seifrizii)

Red-edged dracaena, marginata (Dracaena marginata)

Cornstalk dracaena, mass cane/corn cane (Dracaena fragrans 'Massangeana')

Weeping fig (Ficus benjamina)[5]

Barberton daisy, gerbera daisy (Gerbera jamesonii)

Florist's chrysanthemum, pot mum (Chrysanthemum morifolium)

Janet Craig (Dracaena deremensis "Janet Craig")

Warneckei (Dracaena deremensis "Warneckei")"1



Understanding Indoor Air Pollution

A variety of factors contribute to indoor air pollution. Common sources include volatile organic compounds (VOCs) emitted by household products such as cleaning agents, paints, varnishes, and furniture. Additionally, tobacco smoke, pet dander, pollen, mold spores, and dust mites can also contribute to poor indoor air quality. Inadequate ventilation and the accumulation of outdoor pollutants that infiltrate our indoor spaces further exacerbate the problem.


The effects of indoor air pollution on human health can be significant. Prolonged exposure to polluted indoor air has been linked to various health issues, including respiratory problems, allergies, asthma, headaches, fatigue, and even more severe conditions in some cases. Children, the elderly, and individuals with pre-existing respiratory or immune system disorders are particularly vulnerable.


It's imporant to note in the 2014 review, "While the plant's ability to take up VOCs is well documented in laboratory studies, the effect of plants on indoor air in complex environments like offices requires further investigations to clarify the full capacity of plants in real-life settings."


NASA Study on Air-Purifying Houseplants

The NASA study, conducted in collaboration with the Associated Landscape Contractors of America (ALCA), analyzed the ability of various houseplants to remove harmful chemicals from the air. The researchers focused on substances such as formaldehyde, benzene, trichloroethylene, xylene, and ammonia—common pollutants found in indoor spaces due to the use of synthetic materials, cleaning agents, and household products.


The results were remarkable. Several houseplants demonstrated exceptional air-purifying qualities, effectively absorbing and metabolizing harmful airborne toxins. Plants such as the Peace Lily (Spathiphyllum), Snake Plant (Sansevieria), Spider Plant (Chlorophytum comosum), and English Ivy (Hedera helix) emerged as top performers, showcasing their ability to combat indoor pollutants.


These air-purifying houseplants work through a process called phytoremediation, where they absorb pollutants through their leaves and roots, breaking them down and converting them into harmless substances. This natural purification mechanism not only helps improve air quality but also contributes to a healthier and more pleasant indoor environment.


The NASA study has significantly influenced the field of indoor air quality and has guided homeowners, interior designers, and plant enthusiasts in selecting the most effective plants for air purification purposes.



Top Air-Purifying Houseplants

Certain houseplants have been identified as exceptional air purifiers, effectively removing harmful pollutants from indoor spaces. Incorporating these plants into your home or office can significantly enhance the quality of the air you breathe. Let's explore the top air-purifying houseplants and their unique benefits:


Peace Lily (Spathiphyllum):

Removes common indoor pollutants like formaldehyde, benzene, and trichloroethylene.

Thrives in low light conditions, making it suitable for various indoor spaces.

Its elegant white flowers add a touch of beauty to any room.


Snake Plant (Sansevieria):

Excellent at filtering formaldehyde and benzene.

Known for its resilience and ability to tolerate low light and neglect.

Releases oxygen at night, making it an ideal bedroom companion.


Spider Plant (Chlorophytum comosum):

Effectively removes formaldehyde and xylene from the air.

Easy to grow and produces baby spider plants, adding a decorative touch.

Thrives in bright, indirect light.


English Ivy (Hedera helix):

Removes formaldehyde and benzene.

Adapts well to different light conditions, making it versatile.

Can be grown as a hanging plant or trained to climb on walls or trellises.


Boston Fern (Nephrolepis exaltata):

Efficiently filters formaldehyde, xylene, and other pollutants.

Flourishes in humid conditions, making it suitable for bathrooms or kitchens.

Requires consistent moisture and indirect light.


These air-purifying houseplants not only improve indoor air quality but also add a touch of natural beauty to your living spaces. Incorporating a variety of these plants throughout your home or office can create a healthier and more visually appealing environment.



Downsides of Houseplants

If you have a mold allergy, it's important to consider the potential downsides of having houseplants. While houseplants offer numerous benefits, they can also create an environment conducive to mold growth, which can worsen allergy symptoms. Here are some factors to be aware of:


Moisture and Humidity: Houseplants require regular watering, and excess moisture can promote mold growth. The damp soil, combined with the humidity needed for certain plants, creates an environment favorable for mold spores to thrive.


Soil and Organic Matter: Mold can develop in the soil of houseplants, especially if it remains consistently moist. Organic matter, such as decaying leaves or mulch used in potted plants, can also contribute to mold growth.


Lack of Air Circulation: Insufficient airflow around houseplants can lead to stagnant, humid conditions, providing an ideal breeding ground for mold spores.


Allergic Reactions: For individuals with mold allergies, exposure to mold spores can trigger a range of allergic symptoms, including nasal congestion, sneezing, itchy eyes, coughing, and respiratory issues.



Plants to Avoid For Allergy Sufferers

For allergy sufferers, certain houseplants can exacerbate symptoms and should be approached with caution. Here are some of the worst houseplants for allergy sufferers:

Flowering Plants: Flowering plants, especially those with strong scents, can release pollen that triggers allergic reactions. Examples include lilies, chrysanthemums, tulips, and daisies.

Ficus Tree (Ficus benjamina): The Ficus tree can produce a milky sap that contains allergenic compounds, leading to skin irritation and respiratory issues for some individuals.

Ferns: While ferns are generally not pollen producers, their spores can be a source of allergens for some people, causing respiratory symptoms.

Certain Grasses: Some grass-like houseplants, such as the decorative grass known as Baby's Tears (Soleirolia soleirolii), can produce pollen and cause allergies.

Pine trees can trigger allergies in some individuals due to the pollen they release, causing respiratory symptoms and allergic reactions


While houseplants offer beauty and benefits, it's essential to be aware that certain plants can be hazardous to babies and pets.


Certain houseplants can effectively improve indoor air quality, it is crucial to address the source of pollutants as well. Factors such as paint, car exhaust, off-gassing, and more contribute to indoor air pollution. Taking proactive measures to reduce these pollutants should be the primary line of defense. This includes relocating paints and harsh chemicals to the garage, frequently changing air filters, using vent hoods when cooking, allowing furniture to off-gas in a separate room, painting nails outdoors, and closing windows and doors if living near a busy road. If you do not have allergies to mold or specific plants, incorporating a few houseplants can complement your efforts in enhancing indoor air quality.





Common Questions

Are there allergy-friendly toys available to prevent dust mite infestation?

Yes, there are indeed allergy-friendly toys available specifically designed to prevent dust mite infestation. Parents have found a clever solution by placing their children's toys in the freezer for 24 hours, effectively killing the dust mites. However, if this seems impractical, there are alternative options. Today, you can find a wide range of allergy-friendly children's toys and even toys suitable for pets that are specifically made to withstand frequent washing. These toys are designed to be easily cleaned, minimizing the chances of dust mites accumulating and causing allergies or respiratory issues. With the availability of these allergy-friendly toys, parents can provide a safer and healthier play environment for their children.

Can dust mites be killed by sunlight or freezing?

Dust mites can indeed be effectively killed by both sunlight and freezing temperatures. Exposing items that may be infested with dust mites, such as rugs, to direct sunlight for a duration of three hours can result in their elimination. Similarly, freezing can also be a useful method to eradicate dust mites. By placing items like children's toys in a freezer for 24 hours, dust mites can be killed off. These methods have been widely practiced by parents in order to rid their homes of dust mite infestations.

How do HEPA air purifiers and dehumidifiers help reduce dust mites in the air?

HEPA air purifiers are highly effective in reducing the presence of dust mites in the air. These purifiers work by filtering out airborne particles like dust, mold, pollen, animal dander, and other allergens. Dust mites are microscopic creatures that thrive in environments with high levels of moisture. By capturing these particles, HEPA air purifiers significantly reduce the number of dust mites in the air you breathe.

Additionally, it is important to avoid ionic air cleaners when choosing an air purifier aimed at reducing dust mites. Ionic air cleaners can emit ozone, which is a lung irritant and can trigger asthma attacks and other respiratory issues. Unfortunately, some popular air cleaners actually contribute to air pollution by releasing ozone. To make an informed decision, you can refer to our Air Purifier Buying Guide for more information on selecting the right air purifier to effectively combat dust mites and other airborne allergens.

In addition to HEPA air purifiers, dehumidifiers also play a crucial role in reducing dust mites in the air. Dust mites are unable to survive without adequate moisture levels in the environment, and excess moisture creates an ideal breeding ground for these microscopic pests. By removing excess moisture from the air, dehumidifiers help to create an inhospitable environment for dust mites to thrive in.

To effectively control dust mite populations, it is recommended to maintain a relative humidity level between 40% and 50%. You can use a Digital Humidity Gauge to monitor the humidity levels in your home and ensure they stay within this range. For a more detailed understanding of how dehumidifiers work and the different options available, refer to our comprehensive Dehumidifier Buying Guide.

By using HEPA air purifiers to filter out dust mites and other allergens, and utilizing dehumidifiers to control moisture levels, you can significantly reduce the presence of dust mites in the air and create a healthier indoor environment.

Besides dust mite covers, what other methods can be used to control dust mites in the environment?

To effectively control dust mites in your environment besides using dust mite covers, there are several strategies you can employ:

1. Regular Vacuuming: Vacuuming frequently with a vacuum cleaner equipped with a HEPA (High-Efficiency Particulate Air) filter can help reduce dust mites. HEPA filters are designed to trap at least 99.97% of allergenic particles, effectively removing dust mites and their allergens from carpets, upholstery, and other surfaces.

2. Anti-Allergen Cleaning Products: Use specially formulated anti-allergen cleaning products to clean and dust surfaces in your home. These products are designed to minimize allergens, including dust mite allergens, and help reduce their presence.

3. Anti-Allergen Laundry Care: Washing bedding, curtains, and other fabrics in anti-allergen laundry detergents or adding anti-allergen laundry additives can effectively remove dust mites and their allergens. This step is particularly crucial for items that come into contact with your skin.

4. HEPA Air Purifiers: Consider using HEPA air purifiers to filter the air in your home. These purifiers are effective in capturing particles such as dust, mold spores, pollen, and animal dander, including dust mite allergens. However, avoid ionic air cleaners that can emit ozone, a lung irritant that may trigger asthma attacks and breathing difficulties.

5. Regulate Indoor Humidity: Dust mites thrive in environments with high moisture levels. By using dehumidifiers, you can reduce excess moisture in the air, making it less suitable for dust mites and mold spores to survive. Aim for a relative humidity of 40% to 50% to discourage dust mite growth. Monitoring the humidity using a digital humidity gauge can help you maintain the optimal levels.

By implementing these additional methods, you can create an inhospitable environment for dust mites, effectively reducing their population and minimizing the presence of allergens that can trigger allergies and asthma.

What are dust mites and how were they discovered?

Dust mites are microscopic creatures that belong to the arachnid family, making them relatives of spiders. These tiny organisms were unknown to humans until the invention of the microscope by Anton van Leeuwenhoek in 1694. When Leeuwenhoek first observed these creatures in magnified photographs, he was astonished and disturbed by their presence. Considering their minuscule size, they were unnoticeable to the naked eye. In fact, it was only through the use of a microscope that their existence was revealed.

Dust mites obtained their scientific name, Dermatophagoides, which means "skin eater," due to their feeding habits. The primary source of food for these creatures is dead human skin, which constitutes a significant portion of the dust found in homes. Consequently, even a small cluster of dust can act as an abundant buffet for dust mites. It is worth noting that astonishingly high numbers of dust mites can be found in just half a teaspoon of dust, potentially reaching up to 1,000 individuals.

What are dust mites and how were they discovered?

The number of dust mites present in a mattress can range from about 100,000 to as high as 10,000,000, depending on the age of the mattress. It is important to note that dust mite populations have the potential to grow rapidly. A single female dust mite can lay around 25 to 30 eggs per week, contributing to the exponential increase in their population.