My plan to reduce road pollution !

Hey , You might came across the question in school that "what is the difference between forest and city ?" then remember the first thing that comes in our mind is , forest means full of trees & plants and animals at a same times city means lack of trees & plants and lack of wild animals . And as we know in city there is a many types of pollution going on . But at a same time this not happens in Forest, why is it so ? okay if this question is for child he might answer that "Because there is no humans lives there except mowgli or Tarzan " But the talking wisely we all know there is no production of pollution occurs, except when natural calamities occurs. And whenever pollution from cities moves to the Forest its get filtered by plants and trees , know how ? so plants has a major impact on natural environmental cycle so whenever there is a plant photosynthesis occurs and released oxygen dilutes the toxicity of pollution , and also plants has a great i