| http://www.w3.org/ns/prov#value | - Some larger PAHs are of concern because they are potentially carcinogenic; 16 different PAHs are designated as priority pollutants by the EPA. The percentage of PAHs in crude oil varies, but the 'priority pollutants' are present at low levels in crude oils; they are much more common as a byproduct of burning carbonaceous materials such as fuel, coal, wood, tobacco and other materials.
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