Despite the fact that Voyageurs National Park (Figure 1) exists in a relatively remote setting with no major local source of mercury contamination, all Voyageurs lakes that have been sampled for mercury are listed as impaired by the U.S. Environmental Protection Agency. Mercury contamination in some of these lakes exceeds levels shown to negatively affect the health of fish and wildlife, and fish consumption advisories are necessary in all Voyageurs National Park lakes for protection of human health. Voyageurs National Park exists in a mercury-sensitive landscape; a high proportion of mercury deposited in the watersheds of park lakes is transformed into a toxic and biologically available form, methylmercury. Research shows that the majority of mercury delivered to park lakes is deposited through rainfall and dry deposition and originates from human caused emissions1. The fact that air pollution can cause this level of damage through mercury contamination of fish and wildlife of a fairly remote national park underscores the importance of clean air to aquatic ecosystem health.