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Summary

　

      1.  Fluoride is emitted considerably from phosphate industries,

         which locate mainly in Southeast U.S.

　

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•    2.  Fluoride has various health effects on vegetation, animals,

        and human beings.

　

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•    3.  Fluoride produced in the phosphate manufacturing process

        can be controlled.

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•    4.  New technologies are promising for fluoride control.