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concentrations of Polynuclear Aromatic Hydrocarbons (PNA) in Surface Soils, <br /> Commercial Products, and Foods <br /> Measured PNA Concentration, Reference <br /> Material in Parts per Million by Weight (See Listing) <br /> Soil (open country, <br /> near town) 5 - 120 1 <br /> Soil (town near <br /> highway) 21 - 300 1 <br /> Soil (alpine) 4 - 8 1 <br /> Soil (oak forest) 13 2 <br /> Soil (conif. forest) 7 2 <br /> Used motor oil 85 3 <br /> Creosote (wood 80,000 - 93,000 4 <br /> preservative) <br /> Creosote from treated 200,000 5 <br /> wood <br /> Coal tar (roofing tar) 61 ,000 - 70,000 4 <br /> Petroleum jelly 13 4 <br /> Over-the-counter <br /> dandruff shampoos <br /> Brand A 2,060 5 <br /> Brand B 2,320 <br /> Brand C 2,700 <br /> Medicated soap 5 <br /> (coal tar-based) <br /> Brand A 2 <br /> Asphalt 0.1 - 27 1/ 6 <br /> Spinach 0.028 2/ 7, 8 <br /> Charcoaled meat 0.0026 - 0.0112 1/ 7, 8, 9 <br /> Margarine 0.0026 - 0.0145 3/ 7, 8 <br /> Orange rind / <br /> Near highway 25 4 10 <br /> Desert area 0 / 10 <br /> Steak (broiled) 0.020 5/ 7 <br /> 1/ As Benzo(a) pyrene 4/ As Anthracene <br /> 2/ As Chrysene 5/ As Pyrene <br /> 3/ As Benzo(b) fluoranthene <br />