It is suggested that one plant should be allowed for approximately 10 square yards of floor space, assuming average ceiling heights of 8 to 9 feet. This means that you need two or three plants to contribute to good air quality in the average domestic living room of about 20 to 25 square yards.
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Research has shown that these 10 plants are the most effective all-around in counteracting offgassed chemicals and contributing to balanced internal humidity.
Here are some of the best air-purifying houseplants and the toxins they are most effective at reducing:
1. Bamboo Palm (Chamaedorea seifritzii)—benzene, formaldehyde, trichloroethylene (TCE)
2. Chrysanthemums or mums (Chrysanthemum morifolium)—benzene, formaldehyde, TCE (the most effective plant against TCE according to NASA)