The hype about plants can clean indoor air continues unabated

An old, badly flawed NASA study reported the air pollutant removal rates for a few common types of houseplants. The NASA researcher had been studying the use of biological wastewater treatment systems which are effective. He did one study before he left NASA and has been advocating the use of plants to clean indoor air ever since. In fact, the air cleaning efficiency of indoor plants, even using the inaccurate data from the original or subsequent studies, is less than that delivered by leakage through a building’s exterior envelope in a very efficient, tightly-sealed building. Nevertheless, the attractiveness of the idea that houseplants can clean indoor air and research funded by the indoor plant industry continues to feed the myth and mislead readers. You can see the latest popular media hype at

Plants x