Plants remove toxins from air – up to 87 percent of volatile organic compounds (VOCs) every 24 hours, according to NASA research. VOCs include substances like formaldehyde (present in rugs, vinyl, cigarette smoke and grocery bags), benzene and trichloroethylene (both found in man-made fibers, inks, solvents and paint). Benzene is commonly found in high concentrations in study settings, where books and printed papers abound.
Modern climate-controlled, air-tight buildings trap VOCs inside. The NASA research discovered that plants purify that trapped air by pulling contaminants into soil, where root zone microorganisms convert VOCs into food for the plant.
As part of the photosynthetic and respiratory processes, plants release moisture vapor, which increases humidity of the air around them. Plants release roughly 97 percent of the water they take in. Place several plants together, and you can increase the humidity of a room, which helps keeps respiratory distresses at bay.