BestAirPurifierHQ Team
NASA study research · Updated March 15, 2025
The NASA Clean Air Study
NASA's 1989 Clean Air Study, led by Dr. B.C. Wolverton, tested houseplants in sealed chambers to measure their ability to remove benzene, formaldehyde, and trichloroethylene from the air. While later research suggests the real-world effectiveness is lower than in sealed chambers, the study remains the most cited scientific foundation for the air-purifying plant concept.
The NASA Clean Air Study is the most widely cited scientific foundation for the air-purifying plant concept. While later research has questioned whether the results translate to real-world homes (which are not sealed chambers), the study remains valuable for identifying which plants have the greatest potential for phytoremediation — the ability of plants to remove pollutants from the environment through natural processes.
Top 10 Air Purifying Plants
Ranked by NASA study effectiveness, ease of care, and real-world practicality. All ratings are based on the original 1989 NASA Clean Air Study results.
Snake Plant (Sansevieria)
NASA: 9/10The Snake Plant is virtually indestructible and uniquely releases oxygen at night (most plants do the opposite), making it ideal for bedrooms. NASA ranked it among the top 3 toxin-removing plants. Its tall, architectural shape fits modern interiors perfectly.
Spider Plant (Chlorophytum comosum)
NASA: 9/10The Spider Plant is NASA's top-rated plant for formaldehyde removal and is completely pet-safe. It produces "spiderettes" (baby plants) that dangle from the mother plant, making it decorative and easy to propagate. One of the easiest plants to keep alive.
Peace Lily (Spathiphyllum)
NASA: 10/10The Peace Lily is NASA's top performer for removing multiple toxins simultaneously. Its white flowers add elegance to any room. It is a "canary in the coal mine" for air quality — its leaves droop when air is too dry or toxic, making it a living air quality monitor.
Boston Fern (Nephrolepis exaltata)
NASA: 8/10The Boston Fern is a natural humidifier — it releases moisture into the air while removing toxins. NASA identified it as one of the best formaldehyde removers. It requires more attention than Snake Plants or Spider Plants but rewards you with lush, feathery foliage.
Aloe Vera
NASA: 7/10Aloe Vera is a multitasker — it purifies air, and its gel treats burns and skin irritation. It is a succulent, meaning it stores water in its thick leaves and requires minimal care. The gel inside the leaves is a natural first-aid kit. Place in a sunny window.
Bamboo Palm (Chamaedorea seifrizii)
NASA: 8/10The Bamboo Palm is a tall, graceful plant that brings a tropical feel to any room. NASA ranked it highly for benzene removal. It can grow up to 7 feet indoors, making it a statement piece. Completely safe for pets and children.
English Ivy (Hedera helix)
NASA: 9/10English Ivy is NASA's top-ranked plant for airborne mold reduction — it actually absorbs mold spores into its leaves. Its trailing vines make it perfect for hanging baskets or high shelves. It is aggressive outdoors but well-behaved indoors.
Rubber Plant (Ficus elastica)
NASA: 8/10The Rubber Plant features large, glossy, dark green leaves that make a bold design statement. It is one of the most effective plants for removing formaldehyde, especially in newly furnished rooms with off-gassing furniture. It can grow quite large indoors — up to 8 feet with proper care.
Dracaena (Dracaena marginata)
NASA: 9/10Dracaena is one of the most effective plants for removing multiple toxins simultaneously, according to NASA. Its spiky, architectural form adds height and drama to interiors. There are many varieties — Marginata (red-edged), Janet Craig (dark green), and Fragrans (corn plant) — all with similar air-cleaning abilities.
Areca Palm (Dypsis lutescens)
NASA: 8/10The Areca Palm is one of the best natural humidifiers — it transpires (releases water vapor) at a high rate, adding moisture to dry indoor air while removing toxins. Its feathery fronds create a lush tropical atmosphere. It is pet-safe and can grow up to 7 feet indoors with proper light.
Plants vs HEPA Air Purifiers
Should you rely on plants alone, or do you need a HEPA air purifier? This side-by-side comparison answers the question.
| Factor | Plants | HEPA Air Purifier |
|---|---|---|
| Formaldehyde removal | Moderate to high (Peace Lily best) | Does not remove gases |
| Benzene removal | Moderate (Spider Plant, Dracaena best) | Does not remove gases |
| Particulate removal (dust, pollen) | Negligible | 99.97% at 0.3 microns |
| Mold spore removal | Negligible (English Ivy absorbs some) | Captures airborne spores |
| Smoke removal | Negligible | High effectiveness with carbon |
| Pet dander removal | Negligible | 99.97% capture rate |
| Humidity increase | Yes (Boston Fern, Areca Palm) | No effect |
| Aesthetics & mood | High — improves wellbeing | Varies by design |
| Oxygen production | Moderate (Snake Plant at night) | None |
| Coverage area | Small (one plant per 100 sq ft) | 200-1,100+ sq ft per unit |
| Maintenance | Watering, pruning, repotting | Filter replacement every 6-12 months |
| Upfront cost | $10-$50 per plant | $149-$899 per unit |
| Yearly cost | $5-$20 (soil, fertilizer, pots) | $40-$150 (filters, electricity) |
Bottom line: Plants provide marginal air quality benefits and significant aesthetic and wellbeing value, but they cannot replace a True HEPA air purifier for particle and allergen removal. The best strategy is to use both — HEPA purifiers for the heavy lifting of particle removal, and plants for supplemental VOC reduction, humidity, and the proven psychological benefits of indoor greenery.
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