It's not just Asia. Africa and Latin America are much the same. Curiously, Rwanda is a notable exception* - their authoritarian leader decided to spend a lot of manpower to keep everything clean, and I think there are also heavy fines for littering and dumping garbage.
* notable because usually the correlation is with income/culture, but Rwanda is not rich nor much different culturally from neighbouring trash-inundated countries.
* notable because usually the correlation is with income/culture, but Rwanda is not rich nor much different culturally from neighbouring trash-inundated countries.