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1) "About 2,000 tons of asbestos and 424,000 tons of concrete were used to build the towers, and when they came crashing down they released dust laden with toxins."

2 "But as early as Sept. 13, Mrs. Whitman and the agency put out press releases saying that the air near ground zero was relatively safe and that there were "no significant levels" of asbestos dust in the air. They gave a green light for residents to return to their homes near the trade center site"