There have been many scientific studies on the air-purifying abilities of plants.
A combination of the plant, the roots and the micro-organisms in the soil all play an important part in reducing volatile organic compounds, CO2 and CO from the air. The most well known study was carried out by NASA in 1989. They analysed 19 plants for their ability to reduce volatile organic compounds (VOCs) such as Benzene, Formaldyhyde, Toluene, xylene, trichloroethylene and ammonia in an enclosed area.
All plants removed formaldehyde from the air and many plants removed most VOCs. Four plants removed all VOCs from the air - the Peace Lily (Spathiphyllum ), Parlour Palm (Chamodorea elegans), Lady Palm (Rhapis excelsa) and the good old Chrysamthemum.
Another variable they looked at was the ideal number of plants for air purification which was calculated at 1 plant per 9.3 cubic metres. A recent Australian study calculated that 5 plants in a room makes the air 75% cleaner, and 10 is optimal for maximum health and wellness. We’re a little biased, but we think the more plants the better!