"It is known that mature, leafy trees, such asredwoods, aspens and oaks, are the best producers of oxygen. Additionally, it is known that a tree produces higher volumes when growing than when mature, because converting air and soil into wood causes the tree to produce more oxygen."
Google.com
Sequoia
Redwood
Aspen
Pine
Evergreens (various starting with pink bark to gray-- is least oxygen producing)
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