Mercury levels are high, but why?

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Mercury levels are high, but why?

Toxic element a concern for humans, wildlife
Roger Claybrooke, a meteorologist with the National Atmospheric Deposition Program, adjusts the cover of the mercury monitor installed in 2009. The monitor sits atop an 8-foot-high platform and consists of a glass jar enclosed in a metal box, the roof of which retracts when a sensor detects precipitation.
Kate Williams, an ecological analyst at the Biodiversity Research Institute in Gorham, Maine, measures the bill of a yellow-breasted chat.

Mercury levels are high, but why?

Roger Claybrooke, a meteorologist with the National Atmospheric Deposition Program, adjusts the cover of the mercury monitor installed in 2009. The monitor sits atop an 8-foot-high platform and consists of a glass jar enclosed in a metal box, the roof of which retracts when a sensor detects precipitation.
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Kate Williams, an ecological analyst at the Biodiversity Research Institute in Gorham, Maine, measures the bill of a yellow-breasted chat.
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