MTorrice writes: "Environmental scientists worry about airborne mercury because when it falls to earth, the metal can transform into a toxic compound called methylmercury that travels up aquatic food chains, harming wildlife and people. A new study reports that the methods scientists use to monitor mercury in the air underestimate the levels of a reactive form of the metal. This form, which microorganisms readily transform into methylmercury, may be two to three times more abundant in the atmosphere than previously thought, the researchers say."
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