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Since these trees were originally planted to manage dust, they are generally big and leafy. This has the benefit of creating a lot of shade throughout the city, mitigating a lot of the "heat island" effect which is pervasive in any city since asphalt and concrete are great at absorbing visible spectrum light and radiating it as heat2. Walking down a shady street on a hot summer day is such a pleasant experience when compared to being out in the blistering sun.
Trees are not just great dust sinks and heat shields, but great sound barriers as well3. Having tree lined streets not only reduces the noise of traffic (and the dust kicked up from their tyres), but also protects pedestrians and infrastructure on the sidewalks from stray vehicles.
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