Trees can also help break the force of winds.
The reason that high buildings make it windier atground level is that, as the wind goes higher andhigher, it goes faster and faster.
Whenthe wind hits the building, it has to gosomewhere.
Some of it goes over the top and some goesaround the sides of the building, forcing those highlevel winds down to ground level.
That doesn't happen when you have trees.
Trees filter the wind and considerably reduceit,preventing those very large strong gusts thatyou so often find around tall buildings.
Another problem in built-up areas is that traffic noise is intensified by tall buildings.
By planting a belt of trees at the side of the road, you can make things a little quieter, butmuch of the vehicle noise still goes through the trees.