Study: 29% of San Francisco's air pollution comes from China. http://blogs.wsj.com/chinarealtime/2010/12/01/california-pollution-made-in-china/ …
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@dietrich That was my immediate question. I imagine quite a bit. I'd like to see a map of all of the pollution from China mapped on the US.Thanks. Twitter will use this to make your timeline better. UndoUndo
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