If you want to calculate how many plants are needed for a room in order to achieve the desired air purification, several factors have to be taken into account:
Size of the room,
Conditions for the plants in the room (light/dark, dry/damp),
the plant variety, and
the type and amount of pollutants produced per hour in this room.
The larger the room and the more substances are released in it, the more plants you need. So also, the worse the conditions in a room are, the more plants are needed.
If you opt for very air-purifying plants, it may be fewer plants. If you take plants with a lower air-cleaning capacity, you need all the more plants.
Based on the study results, it is easy to estimate how many plants are needed for a classroom, for example.
Analyses have shown that for (primary) school classes about 350 g leaf mass of an average to well air-purifying plant per pupil is sufficient to keep the air in the classroom clean.
These values were calculated with air-purifying plants in closed, i.e. unventilated plant containers.
By optimising the air-cleaning properties of the plant and the soil organisms in a ventilated plant container such as Airy, the reduction in pollutants can be achieved at just 1 plant per 10 pupils.
In an office measuring about 75 m3, three medium-sized plants that purify the air well are sufficient to halve a formaldehyde concentration that is above the legal standard (MAK values) within four hours.
The required amount of plants can be estimated quite well. The more, the better. So the greater the plant's air-purifying capacity, the better.
The rule of thumb is:
50m3 room air for an air-purifying plant in the Airy pot (Airy M),
75m3 room air for an air-purifying plant in the Airy box (Airy M).
1 plant in the Airy system per room if it is up to 20 square meters in size.
In purely mathematical terms, a plant in an AIRY is 8 to 20 times more powerful than in a conventional pot!