I just saw a very short but fascinating TED Talk by Kamal Meattle called How To Grow Fresh Air.

It describes the 3 plants you need to take with you when living in a sealed bottle (or any other environment where you’d like to improve the air quality) and what they do:

“The Living Room Plant”
Areca Palm (Chrysolidocarpus Lutescens)

• Converts Carbon Dioxide to Oxygen
• You need 4 shoulder height plants per person.
• The leaves should be cleaned once per week
• It should be taken outdoors every 3-4 months.

“The Bedroom Plant”
Mother-in-Law’s Tongue (Sansevierio Trifasciata)

• 6-8 Waist High plants per person.
• Converts co2 to o2 at night

“The Specialist Plant”
Money Plant (Epipremnum Aureum)

• Removes formaldehydes and other toxins

I’ll need to dig a little more into this but it looks very interesting.