^ Not quite.. I have been to India and air is cleaner in Punjab. It might not be cleaner in Bombay or Delhi. It is same like the difference in quality of air between Karachi and Lahore- the latter being much better while city dwellers suffer from various problems in the former.
I am not sure what ravage is saying but I am saying that air is not cleaner where there's lot of industrialization like Karachi or Faisalabad in Pakistan and air is cleaner where there's lot of gobar in Pinds like Pinds of Punjab on either side of the border :D