I would suggest thinking more about the role played by visualizations in the ability of ethnographers studying air pollution "to know but not to find". Both atmotube and the photos visualize air pollution in specific ways and resist "finding" evidence of it, even though residents or the ethnographer knows it exists. What is the stuff that allows the ethnographer to know--sensory experiences, for instance? The question could then become "To sense but not to see" just as much as it is about "to know but not to find"?
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