Been to china multiple times. Depends on where you are as far as visible polution as well as non visible but noticeable polution (eyes, lungs etc.) Some places are really bad, other places are comparable to most large U.S. cities.
But then in the U.S. places near coal fired plants have pretty bad visible and respiratory pollution as well. it's hard to clean up the pollution from coal fired plants, way worse than NG fired plants.
We had a relatively new coal fired plant about 150 miles from us. Every time we drove by it on our trips east the air was visibly darkened, sometimes pretty bad. Now that they have converted it to NG air is visibly clear whenever we drive by.
