First of all, this guy isn't an economist. He's an environmentalist and statistician.
Second, are all his sources on air pollution from his book, The Skeptical Environmentalist, are listed here. Compare the List of Figures and appropriate pages to the pages on air pollution, and you will see quite a bit of backed-up, verifiable, research.
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I have seen all things that are done under the sun; all is vanity and a chase after wind.
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