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nature : usually because of the industrial emissions of sulfur dioxide in the atmosphere gradually oxidation, and with water vapor condenses into sulfuric acid mist; While coal and oil combustion emissions of nitrogen oxides and water vapor will condense into nitric acid mist . Such substances with rain, snow, fog, frost, Lo together landed on the ground, rain, snow, such as the pH is less than 5.6, known as acid rain. Acid rain can damage plant and animal and human, corrosion buildings, soil acidification. Acid rain inflow of Hanoi, can poison fish. Because it is super-border pollution, and are thus by the international attention.
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