| http://www.w3.org/ns/prov#value | - Unprecedented levels of acids, sulphur, fine particles, heavy metals and other dangerous materials were also measured.Asbestos was found at 27 times acceptable levels, and scientists found about 400 organic alkanes, phthalates and polyaromatic hydrocarbons - many suspected of causing cancer and other long-term diseases.The site at Ground Zero went on smoldering, becoming what scientists describe a
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