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Respirable crystalline silica dust is deadly, but the story in PBS's
News Hour is just another reminder that workers and others are not
adequately protected from lung disease. The story can be applied to frac
sand mining stories in WI and elsewhere. And with dust piles exposed in
many locations in NW Wisconsin, even ordinary citizens can become ill.
Take a look at the YouTube video..........it truly is shocking. Several
people have recommended the viewing.