3 Easy Houseplants Can Instantly Reduce Air Pollutant by Up to 20%

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Ordinary potted house plants can potentially make a significant contribution to reducing air pollution in homes and offices.

That’s according to new research led by the University of Birmingham and in partnership with the Royal Horticultural Society (RHS).

During a series of experiments monitoring common houseplants exposed to nitrogen dioxide (NO2)—a common pollutant—researchers calculated that in some conditions, the plants could be able to reduce NO2 by as much as 20 percent.

The researchers tested three houseplants commonly found in homes, easy to maintain and not overly expensive to buy. They included the peace lily (Spathiphyllum wallisii), corn plant (Dracaena fragrans), and fern arum (Zamioculcas zamiifolia).

Each plant was put, by itself, into a test chamber containing levels of NO2 comparable to an office situated next to a busy road.

Over a period of one hour, the team calculated that all the plants, regardless of species, were able to remove around half the NO2 in the chamber. The performance of the plants was not dependent on the plants’ environment, for example whether it was in light or dark conditions, and whether the soil was wet or dry.

Lead researcher Dr Christian Pfrang said, “The plants we chose were all very different from each other, yet they all showed strikingly similar abilities to remove NO2 from the atmosphere. This is very different from the way indoor plants take up CO2 in our earlier work, which is strongly dependent on environmental factors such as night time or daytime, or soil water content.”

The team also calculated what these results might mean for a small office (15 m3) and a medium-sized office (100 m3) with different levels of ventilation. In a poorly ventilated small office with high levels of air pollution, they calculated that five houseplants would reduce NO2levels by around 20 per cent. In the larger space, the effect would be smaller— 3.5 per cent, though this effect would be increased by adding more plants.

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