Watch video:
http://www.ted.com/index.php/talks/kamal_meattle_on_how_to_grow_your_own_fresh_air.html

1. "The Living Room Plant" -- Areca Palm-- Chrysalidocarpus lutescens - 4 plants per person
(doesn't grow well at home without direct sunlight)
2. "The Bedroom Plant" Mother-in-law Tongue" -- Sansevieria trifasciata (snake plant) -- 6=8 plants per person
3/ "Specialist plant" Money Plant-- Epipremnum aureum (Pothos)