A highly populated city means polution and noise.take example as is highly populated.he trees have been cut down which has resulted in air polution .this has caused a variety of major problem is noise polution.he word noise os derived from nausea.noise can damage physiological and psychological health.the more he vehicles the more he noise ans corbon monoxide.CO is very harmful for human beings.diseses caused by noise polution are irriyability and deafness.there are many other diseases.sometimes it leads to mental it should be requested that the parents should not take more than two children.this may control all these polutions.