It takes 50-60 years for a single tree to grow. One tree produces 180 liters of oxygen per day, which is enough for two people to breathe.
One hectare of forest purifies 18 million cubic meters of air, absorbs 30-35% of smoke and emissions, and reduces air pollution by up to 40%. Especially, leafy trees can reduce technical and other noise by 25% and trap 21-76% of dust and dirt particles.
Additionally, it is scientifically proven that trees lower extreme heat and cold by 2-3°C, increase air humidity by 4-7%, and reduce solar overheating by 10-15 times.
It is said that by planting 18 trees, a person can return the amount of oxygen they breathe in their lifetime back to Earth. However, digging a hole and planting a tree is only a small fraction — less than 5% — of the entire process of growing a tree. Studies show that in Mongolia, less than 50% of planted trees actually survive.