Answer: What a terrific goal! I sent you a list of indoor plants earlier, but I have not come across a list of outdoor plants that has been tested in the same way. You didn't say what kind of space you have, but if you have room, any tree will do a great job of reducing particulates in the air, increasing oxygen, and providing shade. Choose a native tree that has plenty of leaves and foliage and is easy to grow. If you don't have room for a tree, choose native shrubs with plenty of leaves. Good luck and please write with other questions!
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