An air tester near the site where one of two smoke stacks at former Sappi paper mill property was imploded on Tuesday, July 18, 2017 in Muskegon, Mich. City officials were concerned that the "Power House Stack No. 1" was a public safety risk after large cracks developed in the stack. Public safety officials set up a 1,000-foot perimeter around the site to keep onlookers safe from asbestos-laden dust from the towering stack's debris. (Joel Bissell/Muskegon Chronicle via AP)
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