| http://www.w3.org/ns/prov#value | - are not very useful for low levels exposures (ATSDR 2000).PAHsPolycyclic aromatic hydrocarbons (PAHs) are a group of more than 100 different chemicals that are formed during the incomplete burning of coal, oil, gas, wood, garbage, or other organic substances, such as tobacco and charbroiled meat.
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