Do indoor plants really purify the air?

Indoor plants can absorb small amounts of pollutants, but in real homes their air-cleaning effect is very minimal. They do not significantly purify indoor air compared to proper ventilation or air purifiers.

What did the NASA plant study actually prove?

The NASA study showed that plants could remove certain toxins in small, sealed lab chambers. It did not prove that a few plants can clean the air in normal homes or apartments.

Are air-purifying plants a myth?

The idea is partly true but mostly exaggerated. Plants help slightly, but they cannot replace ventilation or air purifiers for improving indoor air quality.

How many plants are needed to purify indoor air?

Studies suggest you would need dozens or even hundreds of plants in a single room to make a measurable difference, which is impractical for most homes.

Which indoor plants are best for air purification?

Plants like snake plant, money plant, peace lily, and areca palm are easy to grow and popular, but their air-purifying effect in real homes is very limited.

Do indoor plants improve air quality at all?

Yes, but very slowly. They may slightly increase humidity and trap dust on leaves, but they do not significantly remove indoor pollution.

Are indoor plants better than air purifiers?

No. Air purifiers are far more effective at removing pollutants, allergens, and fine particles from indoor air than plants.

Is opening windows better than keeping indoor plants?

Yes. Opening windows allows fresh air to circulate and is one of the most effective ways to improve indoor air quality.

Can indoor plants reduce stress and improve mental health?

Yes. While plants may not clean air effectively, they help reduce stress, improve mood, and make indoor spaces feel calmer and more comfortable.

Should I buy plants only for air purification?

No. Plants should be bought mainly for decoration, relaxation, and well-being. Air purification should be considered a small bonus, not the main benefit.

Do indoor plants work better in closed rooms?

Even in closed rooms, plants clean air very slowly. Without proper airflow, indoor air quality can still worsen despite having plants.

What is the best way to improve indoor air quality at home?

The best approach is combining ventilation, exhaust fans, occasional window opening, and air purifiers. Indoor plants can be added for comfort and aesthetics.

Why is the NASA plant study often misunderstood?

Because marketing campaigns simplified and exaggerated the findings, making it seem like a few plants could clean an entire house.

Do indoor plants remove carbon dioxide at night?

Most plants release carbon dioxide at night. The amount is very small and not harmful, but it does not improve air quality significantly.

Are indoor plants good for children and families?

Yes. They are safe, calming, and educational for children, but families should not rely on plants alone for clean indoor air.

NASA Study: Do Indoor Plants Really Clean Air?

Deepak Kumar

19 Jan 2026, 09:59 AM IST

Indoor Plant Guides

Many people believe indoor plants purify air. But what did the famous NASA study really say, and does it work inside real homes like ours today?

We all love indoor plants. They make our homes feel calm, green, and vibrant. Many of us also believe that plants magically purify the air in our homes. This idea largely stems from a famous NASA study. But does it actually work in real-world settings like flats and houses? Let's understand this honestly, without any jargon or complicated scientific terms.

Quick comparison:

Best for low light : Snake plant
Best for fast growth : Money plant
Best for beginners : Areca palm
Best for air circulation : Open windows + fan

What was the actual NASA plant study?

The NASA study was conducted in 1989. Its main purpose wasn't home decor. Instead, NASA wanted to purify the air inside space stations. Scientists tested plants in small, sealed chambers. They introduced harmful gases like benzene and formaldehyde. The plants gradually reduced these gases over time.

This study showed that plants can absorb some pollutants. But the testing environment was very small and controlled. It was nothing like our homes, which have open doors, fans, cooking smells, and daily activity.

Photo : The original NASA experiment that sparked the idea of indoor plants and air purification.

Why did this study become so popular worldwide?

Following this study, many blogs and advertisements claimed that "plants purify indoor air." And people loved this idea. They found it natural and safe. Nurseries also promoted air-purifying plants. Gradually, this message spread everywhere, including homes and offices.

But one crucial detail was often overlooked. NASA never said that a few plants could purify an entire house. That part was added later by marketers, not by science.

What happens in real homes, not in lab boxes

Our homes aren't sealed boxes. Air circulates. Windows open. Fans run. Kitchen fumes spread. Outside air comes in. In these conditions, plants clean the air very slowly. The effect is almost imperceptible.

In fact, later studies showed that you might need hundreds of plants in a room for proper ventilation. This isn't practical for typical homes.

Photo : How indoor plants interact with air circulation in real homes, not sealed lab conditions.

Plants help, but in different ways

Even if plants don't significantly purify the air, they still help us a lot. They slightly increase humidity. This is good for dry, air-conditioned rooms. Plants also collect dust on their leaves. When we wipe the leaves, we remove that dust from the room.

Most importantly, plants help our minds. They reduce stress. They make us feel relaxed. This mental comfort is real and valuable.

Indoor Plants vs. Ventilation The Real Difference

Here's a simple table to clear up the confusion:

Method	How It Helps	Reality in Homes
Indoor Plants	Absorb tiny pollutants	Very slow effect
Open Windows	Brings fresh air	Very effective
Exhaust Fans	Removes smoke	Very useful
Air Purifier	Filters air fast	Best for pollution

Plants are a good complement, not a substitute.

The best way to use plants for healthy homes

If you love plants, keep them. But have realistic expectations. Use plants for beauty and tranquility. Combine them with fresh air. Open your windows daily, even if only for 15 minutes. Clean the leaves regularly. Avoid placing too many plants in dark corners.

It's better to adopt simple habits than to believe in miracles.

Should you buy "air-purifying" plants?

If you like their look, you can certainly buy them. Plants like snake plants, peace lilies, and areca palms are easy to care for. They're great for beginners. But don't buy them solely for air purification. That might lead to disappointment.

Plants should primarily bring you joy. The air-purifying benefit is just a small bonus.

A plant lover's final thoughts

Indoor plants don't magically purify the air like machines. And yes, the NASA study was real, but it was misinterpreted. Because in real homes, plants do more to improve mood than to significantly reduce pollution. Still, a home filled with greenery feels better than an empty one. Use plants wisely, let in fresh air, and enjoy the tranquility they bring to everyday life.

💬 Join the Discussion

No discussions yet. Be the first to start one!

Deepak Kumar

Deepak Kumar is an indoor gardening content contributor who focuses on practical plant solutions for small homes and apartments. He has spent years observing common plant problems faced by indoor plant owners and enjoys breaking down complex plant care topics into simple, easy-to-follow guidance. At IndoorPlantify, Deepak contributes articles based on everyday experiences with houseplants, helping readers understand what works, what doesn’t, and why consistency matters in indoor plant care.

Categories

NASA Study: Do Indoor Plants Really Clean Air?

What was the actual NASA plant study?

Why did this study become so popular worldwide?

What happens in real homes, not in lab boxes

Plants help, but in different ways

Indoor Plants vs. Ventilation The Real Difference

Plants are a good complement, not a substitute.

The best way to use plants for healthy homes

Should you buy "air-purifying" plants?

A plant lover's final thoughts

Also Read

💬 Join the Discussion

Categories

NASA Study: Do Indoor Plants Really Clean Air?

Related Articles

What was the actual NASA plant study?

Why did this study become so popular worldwide?

What happens in real homes, not in lab boxes

Plants help, but in different ways

Indoor Plants vs. Ventilation The Real Difference

Plants are a good complement, not a substitute.

The best way to use plants for healthy homes

Should you buy "air-purifying" plants?

A plant lover's final thoughts

Also Read

💬 Join the Discussion