How the Monstera Really Affects Your Indoor Air

But what role does the Monstera really play in our air?

Many people are now asking the same thing: can a jungle of green leaves in the living room make the air noticeably cleaner? The Monstera, often called the Swiss cheese plant, is particularly central to this question. It is large, has a tropical appearance, and is frequently said to have an air-purifying effect indoors.

What the Monstera actually does to the air

Like every green plant, the Monstera carries out photosynthesis: it absorbs carbon dioxide and releases oxygen. Its huge, deeply cut leaves provide a large surface area for this gas exchange. At the same time, its foliage traps dust particles from the room air.

“The Monstera improves the indoor climate – but gently rather than spectacularly.”

Scientific research indicates that Monstera plants can absorb certain volatile organic compounds (VOCs) from the air, including pollutants such as formaldehyde and benzene compounds. In an ordinary living room, however, the effects are considerably smaller than many marketing claims suggest.

Several factors are crucial:

• The size and number of plants in the room
• The plant’s condition, whether vigorous or weakened
• Light, temperature and humidity
• How well the room is ventilated

A single Monstera in the corner of a 20-square-metre room will alter air quality only gradually and to a limited extent. Calling it a “natural air filter” therefore sounds far more impressive than the evidence objectively supports.

How much the Monstera affects different substances

Laboratory studies offer an indication of which substances the Swiss cheese plant influences more effectively and which it affects less well. It is important to note that these are generally controlled conditions rather than real-life home environments.

Type of substance	Effect of the Monstera	Particular points
Carbon dioxide	Moderate uptake	Active only in daylight, as it depends on photosynthesis
Formaldehyde	Slight reduction	Several large plants are needed to achieve measurable effects
Dust particles	Good capture	Broad leaves trap dust, but they must be wiped regularly
Benzene compounds	Limited effect	Considerably weaker than particularly effective “air-purifying” plants

These figures make one point clear: the Monstera can do quite a lot, but it does not replace ventilation or a filtered mechanical air purifier.

Comparison with well-known “air-purifying plants”

Many households deliberately choose particular species to help clean the air: spider plants, devil’s ivy and snake plants are regarded as classic options. Studies often show that they perform better than the Monstera at absorbing certain pollutants.

The Monstera’s strengths lie elsewhere:

• Humidity: Its large leaves evaporate water, increasing indoor humidity.
• Oxygen production: Its vigorous growth means it produces noticeable oxygen during the day.
• Visual impact: One large plant can significantly change the character of a room.

“Anyone who wants clean air is better off combining a Monstera with other plants – and an air purifier.”

Experts assume that around two large plants are needed per 10 square metres for noticeable effects. In a typical living room, this can quickly mean five or more robust specimens – simply unrealistic in many flats.

How to get the most from your Monstera

For the Swiss cheese plant to make full use of its potential, it needs the right care. A half-dried plant with yellow, spotted leaves does very little work for the air; it is struggling to survive.

The most important care points at a glance

• Watering: Water only once the top two finger-widths of soil are dry. Avoid waterlogging.
• Light: Choose a bright location without direct midday sun; bright, indirect light is ideal.
• Humidity: Between 60 and 80 per cent is ideal, for example with a bowl of water or a humidifier nearby.
• Fertiliser: During the growing season, feed it roughly once a month with a liquid complete fertiliser.
• Leaf care: Wipe the leaves regularly with a damp cloth; this improves photosynthesis and dust capture.
• Repotting: Move it into fresh compost and a slightly larger pot at least every two years.

Anyone following these points will have a vigorously growing Monstera with plenty of large leaves – precisely what creates the greatest effect on air and the indoor climate.

Placement: where the Monstera is most beneficial

Where you place the plant also affects the benefits it provides. Many people want better sleep and fresher air in the bedroom. The Monstera can certainly work there, but it only actively affects the air during the day. Plants such as the snake plant, which also release oxygen at night, complement it well.

In the living room or home office, the Swiss cheese plant makes greater use of its strengths. Heating, computers and cooking fumes are present during the day, meaning the room generally needs more humidity and oxygen. A large Monstera near a desk or sofa noticeably improves subjective wellbeing.

Realistic expectations of “plant-based air purifiers”

One of the biggest misconceptions is that a handful of houseplants can completely replace modern air purifiers. Studies clearly show that HEPA filters, ventilation systems and regular rapid airing have a much stronger effect on air quality than individual plants.

“Plants are not competitors to filters – they are the green addition.”

Even so, Monsteras and other houseplants offer genuine benefits:

• They reduce stress levels and have a calming effect, especially in workspaces.
• They improve concentration when sufficient daylight is available.
• They create more pleasant acoustics because leaves absorb sound.
• They make dry heated air more tolerable by releasing water.

Many people automatically perceive rooms with plenty of greenery as “fresher”, even if measuring devices show only moderate differences. This psychological effect is well documented and clearly supports having as many plants as possible in everyday life – including a Monstera.

How useful are plant combinations?

Anyone wanting to work deliberately on air quality will often do best with a “mixed planting scheme in the living room”. The principle is that different plant species take on different tasks.

One possible set-up for a 20-square-metre living room could look like this:

• 1 large Monstera for humidity and visual impact
• 1 snake plant for pollutant reduction and oxygen at night
• 1–2 spider plants for additional VOC filtering
• 1 smaller devil’s ivy for areas with slightly less light

This creates a kind of “mini ecosystem” that balances humidity, oxygen levels and pollutants more effectively than a single standalone plant.

Risks and limits – what households should consider

For all its advantages, the Monstera also comes with a few considerations worth knowing. The plant is not ideal for pets and small children: its leaves and sap contain substances that can cause irritation if eaten or after extensive skin contact. Anyone with cats or dogs should place the Swiss cheese plant out of direct reach.

There is another issue: very high humidity, which would be perfect for the Monstera, can lead more quickly to mould problems in poorly ventilated rooms. More plants therefore mean not only more moisture, but also greater responsibility for airing rooms regularly.

For allergy sufferers, dust capture has two sides. On the one hand, the Monstera catches particles; on the other, the leaves must be kept consistently clean. Anyone who never wipes their plants is merely moving dust from the air to the leaf surface.

What the Monstera can really contribute to the air

The Monstera does not clean the air magically, but it does make a contribution: slightly fewer pollutants, more humidity, more oxygen and, above all, a noticeably more pleasant feeling in the room. Combined with ventilation, a mechanical air purifier and a thoughtful mix of plants, it creates a noticeable effect that many people no longer want to be without.

Anyone who keeps their expectations realistic and looks after the plant properly will get exactly what the Monstera promises: a green housemate that makes the home more attractive – and improves the air at least to some extent.