Recent policies attempting to reduce adverse effects of methylmercury exposure from fish consumption in the United States have targeted reductions in anthropogenic emissions from U.S. sources.
To analyze the prospects for future North American and international emissions controls, we assessed the potential contributions of anthropogenic, historical, and natural mercury to exposure trajectories in the U.S. population over a 40-year time horizon.
We used models that simulate global atmospheric chemistry (GEOS-Chem); the fate, transport, and bioaccumulation of mercury in four types of freshwater ecosystems; and mercury cycling among different ocean basins. We considered effects on mercury exposures in the U.S. population based on dietary survey information and consumption data from the sale of commercial market fish.
Although North American emissions controls may reduce mercury exposure by up to 50% for certain highly exposed groups such as indigenous peoples in the Northeast, the potential effects of emissions controls on populations consuming marine fish from the commercial market are less certain because of limited measurements.
Despite uncertainties in the exposure pathway, results indicate that a combination of North American and international emissions controls with adaptation strategies is necessary to manage methylmercury risks across various demographic groups in the United States.
Cites: Proc Natl Acad Sci U S A. 2007 Oct 16;104(42):16586-9117901207
Cites: Ambio. 2007 Feb;36(1):45-6117408190
Cites: Environ Sci Technol. 2008 Nov 15;42(22):8367-7319068819
Cites: Environ Toxicol Chem. 2009 Apr;28(4):881-9319391686
Cites: Environ Sci Technol. 2009 Apr 15;43(8):2983-819475981
Cites: Proc Natl Acad Sci U S A. 2009 Aug 18;106(33):13865-919666614
Cites: Arch Environ Health. 2001 Jan-Feb;56(1):4-1011256856
Cites: Environ Sci Technol. 2004 Jan 15;38(2):555-6914750733
Cites: Environ Health Perspect. 2004 Apr;112(5):562-7015064162