how many plants to provide oxygen for one person
Scientists estimate a safe oxygen consumption of 50 liters per hour for a human. Meanwhile, a leaf gives off about five milliliters of oxygen per hour. A person would need to be in a room with about ten thousand leaves. About 300 to 500 plants would produce the right amount of oxygen.
The exact number of oxygen producing plants you'll need in your home is going to vary depending on: ~the number of synthetic products and furnishings in your home. The NASA clean air study recommended 15-18 good sized oxygen producing plants and air cleaning plants for an 1,800 square foot house.