Primarily, pollution affects the population because it leads to more diseases being spread and more people dying. deasies are the number one killer in the world today. they are the number one killer because if they are not handled with care and fast they can spread in your whole body and kill you. ."Swater people drink and contaminates the food they eat. It carries typhod and other diseases that can be deadly..."slums... are-in a sense- giant cesspools. Sanitation systems are nearly absent. Human waste leaches into the. slums are very dirty and nasty.