A lot of positive effects come from planting trees in an urban environment. Planting trees can actually contribute to enjoying cleaner air, and by that contribute to a healthier life in the city, as trees absorb CO2 and produce oxygen, and also absorb pollutants like nitrogen, ammonia and sulphur dioxide.
By shading concrete streets, trees help reduce the temperature of the street and the entire city. With their shading properties, trees also help slow the evaporation of water from other plants. By planting trees the right way stormwater runoff, too, can be controlled.
In addition, trees can provide food, improve our mental wellbeing, lend a sense of identity to the neighbourhood; even real estate with more green areas around tends to have higher value than those with little or no green areas.