A houseplant is a plant that is grown indoors in places such as residences
and offices, mainly for decorative purposes, but studies have also shown
them to have positive psychological effects. They also help with indoor
air purification, since some species, and the soil-dwelling microbes
associated with them, reduce indoor air pollution by absorbing volatile
organic compounds including benzene, formaldehyde, and trichloroethylene.
While generally toxic to humans, such pollutants are absorbed by the plant
and its soil-dwelling microbes without harm.
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