The presence and impacts of PAHs in the Great Lakes has been noted in the Canada-ˇOntario Agreement for over three decades. The Ontario provincial government and the Canadian federal government conducted a report, The Status of Tier 1 and Tier 2 chemicals in the Great Lakes basin under the Canada -ˇOntario Agreement, which noted that, “in some cases, the levels of PAHS in open surface water are still above the Canadian Council of Ministers of the Environment (CCME) Canadian Water Quality Guidelines. These exceedances are associated with known industrial sources.”