WillC said:
Select plants based on the available light and enjoy plants because they look nice and make you happy, not because of some exaggerated health benefits. 
Studies proves otherwise. Hospital patients recover faster when rooms are filled with plants. So not only does it have a physical effect, but also mental.
One tiny plant may not be enough, but its better than nothing.
I have a few plants laid out in my house. Snake plant and Areca palm in the living room on each side of the tv. There are 3ft tall. A snake plant in the office, spider plant anf parlor palm in guest bath, spider plant on my room and a spider and snake plant in the main bath.
Not only do they help clean the air, but they make the room look a lot nicer. And provide some humidity.
