Great post Bob! I give it 5 stars.

Especially nice work manipulating the Chinese data. And I like the photos of each location in the balloons.

Could you create regional/province/state subfolders for each country to allow quick location of a city?

I think it would be useful to compare all the results to a global standards such as the World Health Organisation's air quality guidelines (eg pages 275, 326, 375 and 413). That way it would be plain which areas/countries need greater attention to air quality.

Have you considered creating a static (non-network linked) KML that would be imported to the GEC layer so that people browsing their city may serendipitously discover your layer?