Air Pollution - As a Problem !!

Hello friends, i have been told by one of my friend not to be much technical, so i chose a very generalized topic to think on. 

Air pollution being one of the most general topic and we all know about it but what are the step that we are taking towards it? Here are some major countries where air pollution is a major problem: 

What are the major factors which are pollution creators? Lets See:

So you can see that the major pollution creators are not the industries but the vehicles on the street. Now its upto you on what do you want the solution to be on. Any solution in any sector will help to reduce the pollution and that is our prime concern.