ON THE WEB!
Foliage Plants for Removing Indoor Air Pollutants, ntrs.nasa.gov (search for "foliage indoor air")
Foliage Plants for Indoor Removal of Primary Combustion Gases, ntrs.nasa.gov (search for "foliage combustion")
NASA Publications on the Vascular Aquatic Plant Program, ssc.nasa.gov (search for "aquatic plants")