Indoor Plants That Clean the Air: The 15 Best Air-Purifying Plants

Indoor plants that clean the air are among the most practical additions to any home. The landmark NASA Clean Air Study, published in 1989 and updated since, found that common houseplants can remove up to 87 percent of volatile organic compounds (VOCs) such as benzene, formaldehyde, and trichloroethylene from sealed environments within 24 hours. Modern indoor air can be two to five times more polluted than outdoor air, according to the United States Environmental Protection Agency, making air-purifying plants a genuinely useful tool for healthier living spaces.

How Plants Actually Clean the Air

Plants remove airborne toxins through a process called phytoremediation. Leaves absorb gaseous pollutants through tiny pores called stomata, where the chemicals travel to root zones and are converted by soil microbes into nutrients the plant uses. Transpiration — the release of water vapor — also helps reduce airborne particulate matter. Larger leaf surfaces generally mean higher absorption rates, which is why broad-leaf species like the Peace Lily and Elephant Ear consistently outperform smaller plants in laboratory tests.

Researchers at the University of Technology Sydney published a 2019 study showing that a single potted plant placed near a ventilation source reduced CO2 levels by up to 25 percent in a standard office room. While no plant fully replaces a HEPA air purifier in high-pollution environments, strategically placing two plants per 100 square feet of living space produces measurable improvements in air quality within four to six weeks.

Top 15 Air-Purifying Indoor Plants

• Peace Lily (Spathiphyllum) — removes benzene, formaldehyde, trichloroethylene, ammonia, and xylene; thrives in low light
• Spider Plant (Chlorophytum comosum) — absorbs carbon monoxide and formaldehyde; produces oxygen at night; nearly impossible to kill
• Snake Plant (Sansevieria trifasciata) — one of few plants that convert CO2 to oxygen at night; removes benzene, formaldehyde, and toluene
• Boston Fern (Nephrolepis exaltata) — most effective at removing formaldehyde in the NASA study; requires humidity above 50 percent
• Rubber Plant (Ficus elastica) — large waxy leaves absorb airborne bacteria and mold spores; tolerates low light
• Aloe Vera — monitors air quality visually (brown spots signal high chemical concentration); removes formaldehyde and benzene
• English Ivy (Hedera helix) — reduces airborne fecal particles by 94 percent within 12 hours, per American College of Allergy research
• Dracaena — 40-plus species; removes xylene, trichloroethylene, and formaldehyde; some varieties grow up to 3 meters tall indoors
• Bamboo Palm (Chamaedorea seifrizii) — rated highest by NASA for overall air purification; removes benzene and trichloroethylene
• Pothos (Epipremnum aureum) — tolerates neglect and low light; removes carbon monoxide and formaldehyde effectively
• Chinese Evergreen (Aglaonema) — tolerates low light and irregular watering; removes benzene and formaldehyde
• Chrysanthemum (Chrysanthemum morifolium) — filters benzene found in plastics, detergents, and cigarette smoke
• Weeping Fig (Ficus benjamina) — removes formaldehyde, xylene, and toluene; can drop leaves if moved, so choose location carefully
• Gerbera Daisy — one of the best plants for removing trichloroethylene from dry-cleaned clothing; requires bright indirect light
• Heartleaf Philodendron — absorbs formaldehyde more efficiently than most plants; trailing habit suits shelves and hanging baskets

Where to Place Air-Purifying Plants for Best Results

Placement determines effectiveness. Bedrooms benefit most from Snake Plants and Aloe Vera because they release oxygen at night rather than during photosynthesis hours. Kitchens generate formaldehyde from gas stoves and cleaning products, so Boston Ferns and Spider Plants placed near windows provide continuous filtration. Living rooms with new furniture — which off-gases benzene and toluene from adhesives and treated fabrics for up to five years — benefit from Bamboo Palms and Peace Lilies positioned within 1.5 meters of upholstered items.

Home offices and rooms with laser printers are high-risk zones. Laser printers emit ultrafine particles and VOCs during operation. Placing a Rubber Plant or Dracaena near (but not directly beside) a printer reduces ambient toxin levels. Bathrooms are ideal for English Ivy and Peace Lilies, which thrive in high humidity while simultaneously reducing airborne mold spores.

Caring for Air-Purifying Plants

Most high-performing air-purifying plants are low maintenance. Peace Lilies and Pothos require watering only when the top 2.5 centimeters of soil feel dry, typically every seven to ten days. Snake Plants prefer to dry out completely between waterings — overwatering is the leading cause of death for this species. Boston Ferns are the most demanding, requiring daily misting or a pebble tray with water beneath the pot to maintain adequate humidity. Feed all air-purifying plants with a balanced liquid fertilizer diluted to half strength once monthly during spring and summer, and withhold feeding entirely from November through February.

Dust accumulates on leaves over time and directly reduces a plant phytoremediation efficiency by blocking stomata. Wipe large-leaf plants such as Rubber Plants and Dracaenas with a damp cloth every two to three weeks. For fine-leaf plants like Boston Ferns, place them in a shower and rinse gently with lukewarm water monthly. Removing dust can restore up to 30 percent of lost absorption efficiency, according to horticultural studies from Wageningen University in the Netherlands.