Mercury and mercury compounds are extremely toxic substances. Mercury is a metal evaporate at temperatures usually shed concentrations, temperature dependent air. Mercury is concentrated in mineral rock types, the deposition from the atmosphere and the pollution source is industrial production processes, the hospital, burning coal, burning garbage. At the present time the human activities increase the Hg pollution on soil, water, food, and then was the appearance in the air. Mercury in the form of steam and ion very toxic, when humans were the ear drum can fit out ear acute and chronic poisoning cause symptoms of coughing, jaundice, shortness of breath, fever, nausea, nervous disorders ... severe poisoning can be fatal. Currently, for the purpose of profits which the manufacturers ignore toxicity of mercury, consequently caused damage dozens of people, creatures and the environment. However, there are many measures to prevent, treat and handle but the invasion
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