evidence: CLAIM: A NASA study found that six to eight snake plants in a room with no airflow is enough for human survival. The agency therefore recommends 15 to 18 plants for an 1,800-square-foot home. [...] "According to NASA’s Clean Air Study, the Snake Plant is so effective in producing oxygen that if you were locked in a sealed room with no airflow (yikes!), you would be able to survive with just 6-8 plants in it," text on the video reads. "NASA recommends 15 to 18 medium-to-large size plants for a 1,800 square-foot home for optimum air quality." [...] "The reality is that the rate at which they do these processes is much lower than what you need to actually support a human," said Berkley Walker, an assistant professor of plant biochemistry at Michigan State University. Using a generous and general estimate, Walker said, it would likely take leaf area the size of a one-car garage to produce enough oxygen that a human requires in one day. Even then, that’s assuming constant, ideal conditions — such as continuous sunlight. There’s no evidence that snake plants perform at a higher level than other plants, let alone one to support the theory shared online, Walker said.