Having lived in China ...
I can say most of China's populated areas suffer from pollution. I often visit GuangXi Province, in the south-west of the country, and the river that flows through NanNing, the capital, is so heavily polluted it is almost possible to walk across the surface in places.
I have seen the river burning, even.
Unfortunately, Chairman Mao's proclamation that there would be an iron smelter in everyone's back yard was the beginning of the heavily polluted period.
The other problem is that the building zoning regulations are weak and poorly enforced, read bribes vary planning conditions, which means residential properties can end up surrounded by industry,
The final problem is lack of pride through ownership. In countries such as China, Russia and VietNam the people, through the State, own the land and individuals and companies lease the land from the provincial level governments. This means a leaseholder really has no incentive not to pollute the land and therefore conditions can deteriorate badly, quickly.