This list originated from NASA studies of plants that are able to remove chemicals from the air as part of their planning for long term space voyages. There's also a really good TED talk on improving indoor air by using plants.
Personally I just like having plants around, but it's nice to have them validated by NASA!
Edit: Just started thinking that everyone knows it's important not to smoke (whatever) around snakes, because they only have one fully functioning lung, but I bet they would also benefit from increased oxygen and cleaner air in general.
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