Tehran weather and climate

You could find various weather and climate change in this city from the north and south. In the north, you find mountain chain and the south you face with plain with big farm eare. In the city center, you will find a lot of pollution because of concentration cars during the work time. the west is open area and wind below. So pollution is a minus to compare other areas. The east covered by tree and forest but the pollution interrupts after wind blowing.  

In the past Tehran is the best area in terms of weather but after this city change to capital, The uncontrolled expansion is lead to increased pollution.