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The list of suspected contaminants at "ground zero," now considered the worst environmental disaster ever in a major city, is growing: asbestos and other carcinogenic fibers in the blanket of dust, freon from the air-conditioning system (the burned freon may have converted to another toxin, phosgene) and toxic residue from burned office materials, including radiation-filled equipment and cleaning fluids. The most potent threat could be dioxin, a carcinogen formed by burning polyvinyl chloride, found in conduits, cables, wall covering and wastebaskets. Experts believe these ...