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But Dungan adds, "From a taxpayer's point of view, it doesn't make much sense for us as a nation to be paying taxes to collect mercury from these thermometers and then turn around and resell the mercury so somewhere else in the world they can make more thermometers."
Even as mercury is phased out in the U.S., it can find its way right back to the country through atmospheric deposition.
Mercury is a highly mobile element that moves easily within Earth's biosphere. As the only metal that is liquid at room temperature, it has a high vapor pressure and can be transported long distances through the atmosphere before being deposited back to Earth.
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