Do Spider Plants Purify the Air? Science-Backed Facts

By Michael Chen · January 24, 2026

Do Spider Plants Purify the Air? Yes, and Here's How They Help

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

Why Spider Plants Are Effective Air Purifiers

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

Key Pollutants Removed by Spider Plants

Formaldehyde – commonly found in furniture, carpets, and cleaning products
Xylene – present in paints, adhesives, and solvents
Benzene – emitted by plastics, synthetic fibers, and tobacco smoke
Carbon Monoxide – a colorless, odorless gas from fuel-burning appliances

NASA’s Research on Spider Plants and Air Quality

The groundbreaking NASA Clean Air Study (1989) demonstrated that spider plants rank among the top air-purifying houseplants. The study tested over 50 species and confirmed that spider plants significantly reduce indoor air pollution in controlled environments.

Plant Species	Formaldehyde Removal Rate (μg/m³/h)	Xylene Removal Rate (μg/m³/h)	Test Duration
Chlorophytum comosum (Spider Plant)	110	95	24 hours
Sansevieria trifasciata (Snake Plant)	98	87	24 hours
Epipremnum aureum (Golden Pothos)	105	76	24 hours
Average of All Tested Plants	89	73	24 hours

Table data source:1, 2

The data shows that spider plants outperform the average plant in removing both formaldehyde and xylene. With a formaldehyde removal rate of 110 μg/m³/h, they are particularly effective in newly furnished or remodeled spaces where off-gassing is common.

How Many Spider Plants Do You Need per Room?

For optimal air purification, NASA recommends at least one plant per 100 square feet (about 9.3 m²). For a standard bedroom (~150 sq ft), two well-maintained spider plants can significantly enhance air quality. Larger rooms or those with higher pollutant exposure may benefit from three or more.

Tips for Maximizing Air-Purifying Effects

Place spider plants near sources of pollution (e.g., kitchens, garages, or new furniture)
Use porous pots (like terracotta) to improve root aeration and toxin absorption
Keep foliage clean—dust-free leaves absorb pollutants more efficiently
Ensure bright, indirect light to maintain metabolic activity
Pair with other air-purifying plants like peace lilies or snake plants for synergistic effects

Benefits Beyond Air Purification

In addition to filtering toxins, spider plants offer several wellness benefits:

Humidity Regulation: They release moisture into the air, reducing dryness and respiratory irritation.
Stress Reduction: Studies show indoor plants lower cortisol levels and improve mood.
Low Toxicity: Unlike some houseplants, spider plants are safe around pets and children.
Easy Propagation: They produce “pups” that can be replanted, allowing you to expand your air-purifying network at no cost.

Frequently Asked Questions About Spider Plants and Air Purification

Can spider plants really clean indoor air?

Yes, multiple studies, including NASA’s Clean Air Study, confirm that spider plants remove harmful volatile organic compounds (VOCs) like formaldehyde and xylene from indoor air through natural metabolic processes.

How many spider plants are needed to purify a room?

NASA suggests one plant per 100 square feet for effective air purification. For best results, use at least two in frequently occupied rooms like bedrooms or living areas.

Are spider plants safe for pets?

Yes, spider plants are non-toxic to cats and dogs according to the ASPCA. However, excessive ingestion may cause mild digestive upset due to natural chemical compounds that mimic catnip effects.

Do spider plants work at night?

Unlike most plants, spider plants perform CAM photosynthesis, meaning they release oxygen at night. While their air filtration is slower in darkness, they still contribute to air quality after sunset.

What conditions help spider plants purify air most effectively?

Spider plants purify air best in bright, indirect light, moderate humidity, and well-draining soil. Healthy, actively growing plants have higher metabolic rates and thus greater toxin absorption capacity.