It turns out pollution has been around since roman ages and hasn't stopped and isn't going to for a long time.
The world has many currents when it comes to winds and breezes.
The climate and seasons are based on wind, pressure ,and the axis of the earth,but don't forget the sun. The warm and cool air is what creates pressure because of density of the warm and cool air. For the climate it is the average year round. Say if you live near the equator you will get more heat near the poles more cool.