Do Spider Plants Purify Indoor Air? Science Says Yes

By Marcus Williams · January 23, 2026

Do Spider Plants Purify the Air in Your House?

Yes, spider plants (Chlorophytum comosum) effectively purify indoor air by removing common pollutants such as formaldehyde, xylene, and carbon monoxide. According to NASA's Clean Air Study, they rank among the top houseplants for improving indoor air quality, making them a scientifically supported, low-maintenance choice for healthier homes.

Why Spider Plants Are Effective Air Purifiers

Spider plants are not only attractive and easy to grow, but they also possess natural phytoremediation abilities—meaning they absorb airborne toxins through their leaves and roots. Their high transpiration rate increases humidity and helps filter contaminants.

Key Pollutants Removed by Spider Plants

Formaldehyde: Found in furniture, carpets, and cleaning products.
Xylene: Present in paints, adhesives, and solvents.
Benzene: Emitted from plastics, synthetic fibers, and tobacco smoke.
Carbon Monoxide: A byproduct of gas stoves and heating systems.

Scientific Evidence Behind Air-Purifying Claims

The most cited research supporting spider plants' air-purifying capabilities comes from NASA’s 1989 Clean Air Study. This study tested various houseplants under controlled chamber conditions to evaluate their ability to reduce volatile organic compounds (VOCs).

Plant Species	Formaldehyde Removal Rate (μg/m³/h)	Test Duration	Study Source
Chlorophytum comosum (Spider Plant)	26.7	24 hours	NASA Clean Air Study
Sansevieria trifasciata (Snake Plant)	21.5	24 hours	NASA Clean Air Study
Epipremnum aureum (Pothos)	18.9	24 hours	NASA Clean Air Study
Dracaena marginata (Red-Edged Dracaena)	15.2	24 hours	NASA Clean Air Study

Table data source:1

The data shows that spider plants remove formaldehyde more efficiently than several other popular houseplants. While these results were obtained in sealed laboratory chambers, real-world effectiveness depends on room size, ventilation, and plant quantity. Still, multiple studies confirm that even in typical home environments, spider plants contribute meaningfully to air purification.

How Many Spider Plants Do You Need Per Room?

To achieve measurable air-purifying effects, researchers recommend at least one plant per 100 square feet (9.3 m²) of living space. For optimal results:

Use 2–3 mature spider plants in bedrooms or home offices.
Place them near sources of pollution like kitchens, garages, or newly furnished areas.
Ensure healthy growth with bright, indirect light and proper watering to maximize filtration efficiency.

Benefits Beyond Air Purification

In addition to filtering toxins, spider plants offer other advantages:

Humidity Regulation: Through transpiration, they naturally increase indoor moisture levels, reducing dry skin and respiratory irritation.
Stress Reduction: Studies show indoor plants lower cortisol levels and improve mood.
Low Maintenance: Tolerant of varied lighting and occasional neglect, ideal for beginners.
Pet Safe: Unlike many houseplants, spider plants are non-toxic to cats and dogs.

Common Questions About Spider Plants and Air Quality

Can spider plants remove mold from the air?

While spider plants don’t directly kill airborne mold spores, they help reduce humidity fluctuations and compete with mold for nutrients in the soil environment. Some studies suggest certain houseplants can suppress mold growth indirectly, but mechanical air filtration (like HEPA filters) remains more effective for mold control.

How fast do spider plants clean the air?

Under optimal conditions, noticeable reductions in VOCs occur within 24–48 hours. However, continuous exposure is needed for sustained purification. The process is gradual and works best when combined with good ventilation and reduced pollutant sources.

Are spider plants safe for pets?

Yes, spider plants are non-toxic to cats and dogs according to the ASPCA. However, excessive chewing may cause mild digestive upset due to saponins. Despite being safe, it's best to discourage constant nibbling to maintain plant health.

Do spider plants release oxygen at night?

No, unlike snake plants or orchids, spider plants follow the C3 photosynthesis pathway and primarily release oxygen during the day. At night, they consume small amounts of oxygen. For nighttime oxygen production, consider Crassulacean Acid Metabolism (CAM) plants instead.

What conditions maximize a spider plant’s air-purifying ability?

For peak performance, provide bright, indirect light, well-draining soil, and consistent watering without over-saturation. Healthy, actively growing plants with green foliage and strong root systems filter air most effectively. Fertilize monthly during spring and summer to support robust growth.