Caught an article, on an evocative topic, from the Portland Press Herald: indoor houseplants will not only brighten your mood, but benefit your air quality.
It's based on research done decades ago for NASA; they were trying to find ways to filter air during long-distances space voyages and in space stations. The article references B. C. Wolverton's 1997 book, "How to Grow Fresh Air".
The article is correct, as far as it goes. Certain common house plants will absorb particular chemicals, such as formaldehyde, which tend to off-gas from facility furnishings and materials. Problem is, the low amounts absorbed by any reasonable assemblage of houseplants are much lower than what would go away by the occasional opening of a door to let someone in. So it's a neat idea, of little practical utility.
Better to do what we do in commercial janitorial service "Cleaning for Health" program: vacuum all floors, with HEPA filtered vacuums; dust and mop with microfiber, and so on.
Use the houseplants to brighten your mood, and improve your decor.