Why is the pollution different in different parts of the same city?请用英语回答谢谢

请把答案翻译成中文谢谢

It depends on whrere the causes of pollution are and how they influence each other. Let's say there are more cars in the center of the city, the air condition would be worse as the number of cars rises.

There are different population in different parts of the same city,there are less resident who live in this area drive cars,but the other part of the city's resident would drive cars,which create different amount of air pollution

为什么在同一座城市，不同的地方有不同的污染。