Pollution, especially air pollution, generally does not help trees fight infection. On the contrary, air pollution can harm trees and make them more susceptible to disease. Certain types of air pollutants, such as ozone, nitrogen oxides, and sulfur dioxide, can damage tree leaves, reducing their ability to photosynthesize and produce food for the tree. This can weaken the tree's overall health and make it more susceptible to diseases and pests. Additionally, air pollution can alter the composition of the soil surrounding trees, affecting the availability of water and nutrients and further stressing the trees.