Houseplants are best natural indoor air cleaners that filter out pollutants and other toxic chemicals.
Here is a list of graphics by NASA researchers that show these plants are effective in removing benzene, formaldehyde and and trichloroethylene, xylene, and ammonia from the air. These gases have been linked to health headaches and eye irritation.
According to the Clean Air study the graphic Love the Garden shows how plants that are best natural filters.
The research suggest that at least one plant per 100 square feet at home or office is good.