Three ways on how air pollution harms people in areas where it is prevalent include:
1) Health: People living in those areas are extremely vulnerable to respiratory diseases such as breathing problems, asthma etc. Along with that it can cause cancer and other lethal diseases.
Another effect which might be a result of air pollution is the psychological. Some studies show that in areas with more pollution people have more suicidal tendencies compared to those where pollution is not present.
2) Flora and Fauna: Air pollution is affecting the flora and fauna of the area which ultimately is harming people there, as plants and vegetation reduces the levels of carbon dioxide rise and oxygen level drops. Along with other negative effects it also decreases the natural beauty of earth.
3) Air pollution is resulting the global warming changing the earth temperature and water level which can lead to a destructive future for mankind.