Air that in the first desperate days at Ground Zero in lower Manhattan was pronounced by the federal government as safe to breath now turns out to have contained tiny shards of shattered glass, asbestos and pulverized concrete with the acidity of Drano drain cleaner. And those contaminants, along with others, have drained the breath and sapped the health of thousands of rescue and recovery workers, many from the building trades, who helped to pull apart "the pile" in the initial weeks after the attack, say medical researchers.
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