The change from water to water vapor uses heat energy from the air. The larger the tree, the greater the cooling. By using trees in the cities, we are able to moderate the heat island effect caused by pavement and buildings in commercial areas. Air quality can be improved through the use of trees. Leaves filter the air we breathe by removing dust and other particulates.
Rain washes the pollutants to the ground.
Leaves absorb carbon dioxide from the air to form carbohydrates that are used in the plant's structure and function. In this process leaves also absorb other air pollutants such as ozone, carbon monoxide, and sulfur dioxide. By planting trees, we return to a more natural and less artificial environment. Birds and other wildlife are attracted to the area. The natural cycles of plant growth, reproduction and decomposition are again present, both above and below ground.