A serious problem ― Air pollution

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    In recent years, various environmental problems have arisen.  This time, I investigated about air pollution.  It is the most interested problem for me.  I want to explain the cause and measure of air pollution below.
    Air pollution happens with our social activity.  There are the two main causes.  First, when a factory performs a production activity, an air pollution substance is discharged.  Second, an air pollution substance is discharged by use of a car.

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    A serious problem ― Air pollution
    In recent years, various environmental problems have arisen. This time, I investigated about air pollution. It is the most interested problem for me. I want to explain the cause and measure of air pollution below.
    Air pollution happens with our social activity. Ther..

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