check the data on NASA experiment. I believe you have to plant lots of pots to purify a big area. There is a requirement of how many plants/area to make it work.

Any houseplant uses carbon dioxide for photosynthesis, meaning plant uses your fart, and excess aerosol to make their food. So the effect, less carbon dioxide in your home since plant use it, and replace it with oxygen for you to breath.

good question :)
Angie