Many green plants that are used to decorate living rooms and kitchens are marketed as air-purifying. However, scientists largely agree that plants can't do very much to clean an entire room. Now, a Parisian company known as Neoplants is trying to change that by growing genetically modified(转基因的) plants that help remove harmful chemicals from the air.

Its first product, called the Neo P1, is a bioengineered version of the pothos (绿萝). Pothos is characterized by its green leaves and is relatively easy to care for. The Neo P1 is meant to capture and recycle dangerous air pollutants commonly found in homes called volatile organic compounds (挥发性有机化合物VOCs), which are often human-made chemicals. So it's a popular choice for people looking to beautify their living spaces. But the Neo P1 starts at $179, and to purchase one, potential shoppers must first join a waitlist.

The idea of air-purifying plants came from a 1989 study by NASA,in which regular houseplants were tested in two-by-two-foot rooms. When scientists filled these rooms with VOCs, they found the plants could absorb some of the harmful compounds. "Actually, it'd take about ten houseplants per square foot to noticeably improve air quality," Michael Waring, an environmental engineer at Drexel University who wasn't involved with Neoplants, reported in a 2019 study. "Plants, though they do remove VOCs, remove them at such a slow rate that they can't compete with the air exchange mechanisms already happening in buildings," Waring said.

As for Neoplants, its Neo Pl was tested in a 35-liter glass room. In it, the Neo P1's results were 30 times better than NASA's, according to the company—which means it'd still take a large number of them to clean a room. Currently, the company's engineers are designing testing sites that more accurately resemble（与...相似）living spaces. To Neoplants' executives, cleaning the air inside a home is a more logical starting point than trying to filter（过滤）the entire atmosphere.