Scientists remain perplexed as to the exact mechanism that allows plants to impact pollutant levels in a room as seen in the experiment. FOX13
Each plant was isolated in a test chamber containing levels of nitrogen dioxide — a common pollutant — comparable to an office located next to a busy road.
"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 nighttime or daytime, or soil water content," said study researcher Dr. Chrsitian Pfrang.
"We don't think the plants are using the same process as they do for CO2 uptake, in which the gas is absorbed through stomata — tiny holes — in the leaves. There was no indication, even during longer experiments, that our plants released the NO2 back into the atmosphere, so there is likely a biological process taking place also involving the soil the plant grows in — but we don't yet know what that is," Pfrang added.
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