It is true that nowadays there is a direction of people changing their residences from the countryside to urban areas. While this treand that has been noticed in some countries worldwide, I believe that such behaviour negatively imapacts these countries on a variety of levels. The growing number of people living in the cities has had many effects on people's lives. It has been a major challenge to countries' governments to accomodate for the highest ever number of people living in cities inspite of the improvements done in public services sectures, such as building new schools , hospitals and residential areas. Moreover, the increasing number of cars would really paly a role in worsening the pollution in cities. For instance, in Cairo, a study was done a study was done to show the effect of the immigration of 3 million households from rural areas to Cairo. Shockingly, this study revealed that there was a significant rise in pollution levels 3 months after the studied movement hap...