How migration from rural and urban areas leads to environmental degradation? Write one significant observation.

In rural areas there is not much facilities available for both transportation and daily luxury appliances like cars and air conditioners, in short there is much dependence on natural supplies and for transportation people either prefer walking or use cycles, while the moment people from rural areas migrate to urban areas they get more exposed to urban diseases caused due to factors like smoke from the factories and cars, consuming deadly contaminated water  caused due to dumping of toxic chemical wastes etc.And because of fast lives and zero possibility to move faster and safely to their working places they then afford to buy automobiles Hence DEGRADING THE Environment.