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chromium (+6), polycyclic organic matter, formaldehyde, and benzene. The risk <br />estimates in this study were based only on dispersion model results. No ambient air <br />monitoring data were available at that time to compare to modeled concentrations. <br /> <br />In comparison to the MPCA's "urban soup study", a 5-city study conducted by the <br />Environmental Protection Agency identified polycyclic organic matter. (POM), 1,3- <br />butadiene, formaldehyde, chromium (+6), benzene, methylene chloride, and ethylene <br />oxide as pollutants contributing the most to excess cancer risk (EPA 1989). This study <br />used acma! ambient air monitoring data to estimate cancer risks. A statewide monitoring <br />study could help gather data in M]nn~om tO identify the most important chemicals in the <br />ambient air and to more accurately ~mate potential risks from these chemicals. <br /> <br />B. Persistent and/or Bioac~umulative Pollutant Effects on Human Health and the ~nvironment <br /> <br />1. What are the chemicals of concern in MinnesOta'S ellvironment? <br /> <br />To date, mercury has been identified as a chemical of concern in Minnesota's <br />environment (MPCA 1994a). In addition, PCBs and dioxins have received considerable <br />attention in the Minnesota Department of Health's fish consumption advisories that are <br />published yearly for selected lakes in the state. However, them is limited data for other <br />pollutants. <br /> <br />The EPA's Great Waters Program (1994) has identified the following as "chemicals of <br />concern" for the Great Lakes, Lake Champlain, Chesapeake Bay, and other "Crma <br /> <br />Cadmium and compounds <br />Chlordane <br />DDT/DDE .. <br />Dieldrin <br />Hexachlorobenzene <br />alpha-Hexachlorocyclohexane (alpha-HCH) <br />Lindane (lambda-Hexachlorocyclohexane) <br />Lead and compounds <br /> <br />Meamury and ¢omt>otmds <br />Polychlorinated biphenyks (PCBs) <br />Polycyclic or~nic ma_~er (POM) <br />2,3,7,8-Tetrachlorod~enzn furan (2,~,7,8-TCDF) <br />2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD) <br />Toxaphene <br />Nitrogen compounds <br /> <br />The Lake Superior Binational Program (1995) has identified the following as "Lake <br />Superior critical pollutants": <br /> <br />Alpha-BHC Aluminum <br />Chlordane Arsenic <br />DDT/DDE Cadmium <br />Hepm:hlor epoxide Chromium <br />· Hexachlorobenzene Copper <br />Oc~hlorostyrene Iron <br />Polycyclic Aromatic Hydrocarbons Lead <br /> <br /> <br />