thenjagan: cyanobacteria aren't plants, and they're certainly not "house plants" suitable for the average room in a house or apartment. lol.
From allexperts.com:
NASA discovered that a number of common houseplant clean chemicals from the air and convert carbon dioxide to oxygen in the air. The best plants are:
Hedera helix English ivy
Chlorophytum comosum spider plant
Epipiremnum aureum golden pothos
Spathiphyllum `Mauna Loa' peace lily
Aglaonema modestum Chinese evergreen
Chamaedorea sefritzii bamboo or reed palm
Sansevieria trifasciata snake plant
Philodendron scandens `oxycardium' heartleaf philodendron
Philodendron selloum selloum philodendron
Philodendron domesticum elephant ear philodendron
Dracaena marginata red-edged dracaena
Dracaena fragrans `Massangeana' cornstalk dracaena
Dracaena deremensis `Janet Craig' Janet Craig dracaena
Dracaena deremensis `Warneckii' Warneck dracaena
Ficus benjamina weeping fig
Read more here: http://en.allexperts.com/q/House-Plants-721/Oxygen-giving-house-plant.htm