[RcouF1uZ4gsC]

If you look at the list of cities, they are mostly in countries that are undergoing massive industrialization. If you look at the equivalent stage in the West about a hundred years ago, you would see the New York, Chicago, London, Pittsburg also with massive pollution. As countries became more industrialized and wealthy, they switch from caring about growth above all else, to caring more for quality of life and reducing pollution is a big part of that. That period occurred for the US in the 60’s and 70’s. You can see that dynamic already taking hold for example in Beijing where the Chinese government is trying to reduce its pollution problem by regulating cars and pushing electric vehicles.