Does Monstera deliciosa Really Clean Indoor Air?

In countless living rooms, the Monstera deliciosa has long taken centre stage. Commonly called the “Swiss cheese plant”, it is also known simply as the split-leaf philodendron. Social media celebrates it equally as a design statement and an air-quality wonder. Yet does this fashionable plant genuinely make a noticeable difference to indoor air, or is its effect largely symbolic?

What the Monstera really does for indoor air

The basis for any effect on the air is straightforward: photosynthesis. A Monstera absorbs carbon dioxide and releases oxygen. Its large, perforated leaves provide plenty of surface area for this process, so it does make a clear contribution to a pleasant indoor climate.

“The Monstera improves the living environment – but it does not replace mechanical air purification.”

Its broad leaves also act rather like dust collectors. Fine airborne particles settle on their surfaces instead of continuing to float around the room. Wiping the leaves regularly therefore removes some of the dust from the immediate environment as well.

Can a Monstera filter pollutants from the air?

Ever since the well-known NASA study of the late 1980s, houseplants as air purifiers have remained a popular subject. At the time, researchers tested a range of species in sealed spaces with high levels of pollutants. Monstera was not among the plants examined in the original research, although more recent work has included it.

The finding is this: the split-leaf philodendron can absorb certain volatile organic compounds (VOCs) to a limited extent. However, the impact is modest, particularly in an ordinary living room where fresh air constantly enters, doors are opened and pollutant concentrations are far lower than under laboratory conditions.

Pollutant	Effectiveness of the Monstera	Note
Carbon dioxide	Moderate uptake	Only in light, through photosynthesis
Formaldehyde	Slight reduction	A visible effect occurs only with several large plants
Dust particles	Relatively effective binding	Broad leaves capture particles effectively
Benzene	Very low effectiveness	Other species clean this far more effectively

One plant in a 20-square-metre room will therefore not create “laboratory air”. It is better viewed as a small, continually working addition to a wider approach involving ventilation, cleaning and mechanical filtration.

Comparing Monstera with established air-purifying plants

People choosing houseplants primarily for air purification often turn to familiar options such as snake plant, pothos or spider plant. Studies regard these species as particularly hardy and effective at processing certain pollutants.

• Snake plant (Sansevieria): Extremely easy to care for, filters various VOCs and copes well with dry air.
• Pothos: Vigorous growing, with good pollutant-breakdown results in laboratory trials.
• Spider plant: Known for consistent air-purifying values and uncomplicated care.

The Monstera is more of a supporting player than a top performer in this group. Its real advantage lies elsewhere: combining oxygen production, mild humidification through evaporation and considerable decorative appeal.

More humidity, greater comfort

Through its leaves, a Monstera steadily releases water into the surrounding air. In homes with dry central-heating air, this can noticeably create more comfortable air to breathe, less throat irritation and less dry skin.

“Monstera plants act like small natural humidifiers – especially when grouped together.”

The resulting rise in humidity may indirectly protect mucous membranes and reduce irritation. Anyone who speaks frequently while working from home or spends long periods at a computer is likely to notice these differences sooner than abstract readings for individual pollutants.

How many plants does a room actually need?

Experts assume that roughly two larger plants are needed per approximately ten square metres to achieve measurable effects on air quality. That is not especially unrealistic with Monsteras, as they can grow to an enormous size over time.

Anyone wanting to improve their living room deliberately could, for instance, combine:

• 1–2 large Monstera plants for humidity, oxygen and visual appeal
• 2–3 demonstrably “strong” air-purifying plants, such as spider plants or snake plants
• Regular burst ventilation and, where needed, an air purifier with a HEPA filter

This creates a kind of “plant team” in which each plant takes on different tasks. The Monstera provides the visual focal point, while less conspicuous species quietly contribute in the background.

Healthy plant, better air: care makes the difference

Only a vigorous plant can photosynthesise properly and add moisture to the air. To get the most from a Monstera, follow several simple rules:

• Water only once the top one to two centimetres of compost feel dry.
• Choose a bright spot with indirect light and avoid direct sunshine.
• Keep humidity at around 60 to 80 per cent, for example with bowls of water or a humidifier.
• Wipe the leaves routinely with a damp cloth so dust does not “block” them.
• Repot into fresh compost every two years to support the roots and nutrient supply.

Neglecting these points may still leave you with a decorative plant, but it will have a much smaller effect on the air. Yellow leaves, limp shoots or water sitting in the pot are clear warning signs.

Where a Monstera is most useful

Its position determines whether a Monstera is merely decoration or makes a genuine contribution to the indoor climate. Areas where people spend long periods are ideal, including the living room, home office and reading corner.

It can also be kept in a bedroom, although opinions on this often differ. Some people value the extra humidity there, while others dislike having large plants close to where they sleep. If unsure, place it by the window opposite the bed or slightly to one side instead.

Plants, mental wellbeing and productivity

One frequently overlooked benefit of the Monstera has nothing to do with measured values: its psychological effect. Research shows that even a few green plants in a room can lower stress, improve concentration and lift the mood.

“Many people feel more present, calmer and more creative with plants around them – without any measuring device.”

The Monstera is especially suitable in this respect because it is quickly perceived as a “housemate”: large, striking and somewhat wild in its growth habit. This character makes it particularly appealing for home offices, open-plan kitchen-living spaces and studios.

How to combine Monstera intelligently with other plants

Those taking air quality and wellbeing seriously are best served by mixed plant arrangements. A possible setup for a 20-square-metre living room could look like this:

• One large Monstera near the window as a visual anchor
• A snake plant in the bedroom area or a shadier corner
• A spider plant on a shelf or hanging system to “work on” higher layers of air
• Smaller herbs or hardy green plants on the desk to bring greenery closer to the workspace

This distributes the effect throughout the room rather than concentrating it in one corner. At the same time, it creates small green zones that make the space feel more welcoming.

Risks and limits: when plants are not the answer

Anyone with severe allergies, asthma or mould problems at home should not see Monsteras and other houseplants as substitutes for structural repairs or medical measures. In such cases, professional remediation, filtration systems and medical care matter far more than any “miracle plant”.

There is another consideration: excessive humidity from too many plants in small rooms can eventually cause mould, which is exactly the opposite of the intended result. A hygrometer helps keep an eye on humidity levels.

A realistic conclusion: what to expect from a Monstera

A Monstera does clean the air, but only to a moderate degree. Anyone expecting one pot to neutralise every pollutant will be disappointed. However, it works well as part of a sensible overall strategy: regular ventilation, an air purifier if appropriate, and a handful of carefully selected houseplants.

That is exactly where the split-leaf philodendron excels: as a large, distinctive plant that provides oxygen, releases moisture, traps dust and, incidentally, makes a home feel considerably friendlier. For many people, that is enough to say: this plant improves my life – even if it cannot replace a medical device.