Minnesota Public Radio slideshow:
North Dakota clean air dispute continues
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Terry O'Clair is director of the North Dakota Health Department's air quality division. He says monitors are the truest assessment of air quality. (MPR Photo/Bob Reha)

Terry O'Clair is director of the North Dakota Health Department's air quality division. He says monitors are the truest assessment of air quality.

(MPR Photo/Bob Reha)
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