I’d say that trees surrounded by clean air have a better chance of being healthy, although some trees are thought to be somewhat pollution-resistant. Smog in southern California causes browning of pine tree needles and induces them to fall prematurely. Plants affected by ozone pollution can develop spots on their leaves as well. Ash tree declines in upstate New York have also been tied to air pollution stress. Oak trees are thought to be resistant to pollution. Another invasive tree, the Tree of Heaven, which is the tree referred to in A Tree Grows in Brooklyn, is extremely hardy and has no problem thriving in polluted areas.
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