I love plants and am looking for plants that will improve air quality and are safe for kids (because you know the babe will try a leaf or two if he can to it!). Right now we only have a few plants in the house, and only a peace lily in the baby's room. I'm hoping to add at least one more to his room soon.

Here's a helpful excerpt from Inhabitots:

If you want to get serious about air filtering flora, there are five plants that top both NASA’s air purifying and Parent Center’s child-safe lists:

1. Chlorophytum Comosum aka Spider Plant

2. Sansevieria aka Snake Plant

3. Dracaena fragrans `Massangeana’ aka Corn Plant

4. Epipiremnum Aureum aka Golden Pothos

5. Aglaonema Modestum aka Chinese Evergreen

(forget about English Ivy and the others, as they can be poisonous)

I've found some contradicting info on this subject. Here are a few additional links. Wiki page on air-filtering plants with NASA information.

Child & pet-safe houseplant article by S. Elliott.

List of non-toxic plants from the Poison Control Center and the Children's Hospital of Philadelphia.