| http://www.w3.org/ns/prov#value | - Common chemicals are benzene, styrene, formaldehyde, polychlorinated dibenzodioxins (PCDDs; also known as dioxins), polychlorinated dibenzofurans (PCDFs; also known as furans), polychlorinated biphenyls (PCBs), and heavy metals such as lead, mercury and arsenic.
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