One week of walking the streets of Shanghai from morning untill evening and my shooes are just slightly dusty. In almost any other city they would look like this after thirty minutes and after a week they would have been light grey from all the dust.
Shanghai is an incredably clean city.
And I love the fact that I have not seen any trash being put out on the street. Seeing the sidewalks lined with garbage bags in Dublin was a cultural shock for me. In this respect, China is much less of a developing country than Ireland.