Dan Cziczo, a storm expert at Purdue University (IMAGE)

Purdue University

Dan Cziczo, a storm expert at Purdue University

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Dan Cziczo, a storm expert at Purdue University, found that strong summer storms in the Midwest are punching wildfire smoke up into the stratosphere — a previously pristine part of the atmosphere. (Purdue University photo/John Underwood)

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(Purdue University photo/John Underwood)

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