| http://www.w3.org/ns/prov#value | - The EPA considers a cancer risk of 1 in a million or greater as a matter of concern, although those levels do not always trigger regulatory actions.Environmentalists said the study???s findings provide clear evidences that tougher measures are needed to reduce releases of toxic chemicals ??? such as benzene, mercury, formaldehyde and other carcinogens ??? from automobiles, power plants and industr
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