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Chrysanthemum
This is another plant that has seriously air-clearing properties. In one landmark NASA study that established the link between plants and cleaner air, mums removed 61 percent of formaldehyde, 53 percent of benzene, and 41 percent of trichloroethylene from a sealed chamber in 24 hours. The plants look pretty on your nightstand, too. To keep them happy, put them in full sunlight and water them frequently. They’ll flower from September to the first frost and will provide hours of better sleep in between.

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