I’ve heard (from missionaries) that the dirtiest part is the very air one has to breathe in urban areas. They came back to visit their families for the holidays and did laundry. The parkas they wore everywhere (colder northern China) had to be washed five or six times before the discharge water wasn’t filthy and stinking.
Yes, yes and YES.
Between China and India, the filthy award does go to China. I was SHOCKED at how filthy Mexico, Africa and India were...until I got to the "filthy" capital of the planet: China, which means "center of the world" in Chinese.
Isn't it interesting that some of these OLD, old societies sometimes tend to lean on their old accolades and forget that NO ONE cares now that back 3000 years they had big, bad civilizations?