History.com & this guy, 16 of the top 20 polluted cities in the world are in China. The State Department has a more conservative statistic, but I wouldn't exactly say that people in China have hopped on the environmental bandwagon. Even so, some cultural norms turn out to be environmentally friendly despite a general nonchalance on the subject.
For example, almost everything that's recyclable gets recycled - not by your standard suburban family, but by the people who make their living sorting through garbage cans for sellable materials. The grocery stores don't provide bags for you (customer service is a relatively new concept here), so almost everyone carries their own shopping bag to the store. & millions of people (I can safely say that in the largest city in China) use public transportation every day instead of driving a car around town.
Now if we could just get rid of all that smog.