Yes, if they grow at all. Smog has a devastating effect on plantlife, from the creation of acid rain to the lack of healthy oxygen and in cities particularly heavy in smog (like Los Angeles) the amount of growing plantlife has been cut down dramatically. In L.A., 50% of trees die from the pollution.
Smog certainly makes trees grow slower, but it also affects their overall health. This is due to the presence of ozone in smog. Some symptoms of trees that have been affected by smog include premature leaf or needle dropping, mottled leaves, and an increased vulnerability to bark beetle attacks and disease.
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