Do Spider Plants Clean the Air? Science-Backed Facts

By Sarah Chen · April 13, 2025

Yes, spider plants (Chlorophytum comosum) do clean the air. According to NASA's Clean Air Study, they effectively remove common indoor pollutants like formaldehyde and xylene, making them one of the most efficient, low-maintenance houseplants for improving indoor air quality.

How Spider Plants Improve Indoor Air Quality

Spider plants are recognized for their ability to absorb airborne toxins through their leaves and roots. Once absorbed, these harmful substances are broken down by the plant and its associated soil microorganisms. This natural filtration process enhances indoor air purity without requiring any energy input or maintenance beyond regular watering.

Mechanisms Behind Air Purification

Absorption of volatile organic compounds (VOCs) through stomata in leaves
Translocation of toxins to roots where microbes metabolize them
Release of oxygen during photosynthesis, increasing indoor oxygen levels
Removal of carbon dioxide, especially effective during daylight hours

NASA’s Research on Spider Plants and Air Cleaning

The 1989 NASA Clean Air Study brought widespread attention to the air-purifying capabilities of common houseplants, including the spider plant. The study was conducted in sealed chambers to simulate closed environments like space stations, but findings have been applied widely to homes and offices.

Toxin	Removal Rate (μg/m³/hour)	Exposure Reduction (%) over 24h
Formaldehyde	22.1	58%
Xylene	15.6	42%
Benzene	9.8	32%
Carbon Monoxide	7.3	25%

Table data source:1, 2

The data shows that spider plants are particularly effective at removing formaldehyde, a chemical commonly found in furniture, carpets, and cleaning products. A reduction of up to 58% in formaldehyde concentration was observed within 24 hours in controlled environments with adequate plant density.

Benefits of Using Spider Plants Indoors

Beyond air purification, spider plants offer several advantages that make them ideal for both novice and experienced plant owners.

Low Maintenance and High Resilience

Thrives in indirect sunlight; tolerates low light conditions
Adaptable to various humidity levels
Resistant to most pests and diseases
Grows rapidly and produces 'spiderettes' for easy propagation

Safety and Accessibility

Unlike some ornamental houseplants, spider plants are non-toxic to humans and pets, according to the ASPCA. This makes them a safe choice for homes with children or animals.

Optimal Placement and Care Tips

To maximize air-cleaning efficiency, place spider plants in areas with moderate to bright indirect light. Avoid direct sunlight, which can scorch the leaves. Use well-draining soil and water when the top inch of soil feels dry.

Recommended Room Locations

Bedrooms: Enhances nighttime air quality and promotes relaxation
Kitchens: Helps filter fumes from gas stoves and cleaning agents
Home Offices: Reduces VOCs from printers, computers, and furniture
Bathrooms: Thrives in humid environments and reduces moisture-related pollutants

For best results, use one spider plant per 100 square feet of living space to achieve measurable air quality improvements.

Frequently Asked Questions About Spider Plants and Air Purification

Do spider plants really clean the air?

Yes, scientific studies, including NASA's Clean Air Study, confirm that spider plants remove indoor air pollutants such as formaldehyde, xylene, and benzene through natural phytoremediation processes.

How many spider plants do I need to clean the air in my home?

It is recommended to have at least one medium-sized spider plant per 100 square feet of space. For larger homes, multiple plants placed in key rooms like bedrooms and living areas will improve overall air quality.

Can spider plants remove cigarette smoke from the air?

While spider plants help reduce some chemicals found in cigarette smoke, such as benzene and formaldehyde, they cannot fully eliminate all harmful particulates or replace proper ventilation and air purifiers in smoking environments.

Are spider plants better than air purifiers?

Spider plants provide natural, low-cost air filtration but work more slowly than mechanical air purifiers. They are best used as a complement to, not a replacement for, HEPA-based air cleaning systems.

Do spider plants release oxygen at night?

No, spider plants primarily release oxygen during the day through photosynthesis. However, they do not emit significant CO₂ at night, making them suitable for bedrooms despite not being CAM plants like succulents.

Conclusion

Spider plants are scientifically proven to enhance indoor air quality by removing harmful pollutants like formaldehyde and xylene. Their ease of care, safety around pets, and rapid growth make them an excellent choice for homeowners seeking natural, sustainable ways to breathe cleaner air indoors. Supported by NASA research and real-world performance, incorporating spider plants into your living space is a simple yet effective step toward healthier indoor environments.