Top 3 Oxygen Plants 
1. Areca Palm
The Areca Palm also absorbs carbon dioxide and produce oxygen to detoxify the surroundings. Areca Palm also purifies the environment where it is placed by removing dangerous chemicals such as formaldehyde, xylene and toluene.
2. Snake Plant
The Snake plant purifies air by absorbing toxins through the leaves and producing pure oxygen. In fact, the Sansevieria is an ideal bedroom plant. Whereas most other plants release carbon dioxide at night (in the absence of photosynthesis), the Sansevieria continues to produce oxygen.
3. Money Plant
Due to its particular affinity for volatile organic compounds most commonly in the form of off-gassing from synthetic paint or carpets, it is a powerful air purifying plant. In fact, it is an ideal bedroom plant. Money plant continues to produce oxygen at night unlike other plants that produce carbon dioxide at night