evidence: Did a NASA study find that snake plants, a type of houseplant, improve air quality in your home while you sleep? No, that's not true: A public affairs officer for NASA told Lead Stories that NASA has not made this claim and that the results taken from a 1989 study it ran on air-quality factors have been misinterpreted. A 2019 study found that a room would have to contain up to 1,000 plants in order for the plants to improve air quality. Having just a couple of plants, like many homes do, will not produce better air. [...] The Shelmerdine article claims that a NASA Clean Air Study found that the snake plant produces oxygen so effectively that if a person were stuck in a sealed room with no airflow, they would be able to breathe if six to eight snake plants were present. For a non-sealed room, the article claimed, the study found that 15 to 18 "medium-to-large" snake plants would improve the air of a 1,800-square-foot home. [...] NASA public affairs officer Robert Margetta denied, in a May 26, 2023, email to Lead Stories, that the NASA study had found that snake plants purify residential air quality. The houseplants used in NASA's study were not in spaces where people would normally find themselves, he said: