Acid rain is a very serious environmental problem that exists today because of high-energy consumption in the industrial world. Acid rain is snow, fog or rain that has been polluted by acid in the atmosphere. Rain is naturally acidic because carbon dioxide, found normally in the earth's atmosphere, reacts with water to form carbonic acid. While "pure" rain's acidity is pH 5.6-5.7, actual pH readings vary from place to place depending upon the type and amount of other gases present in the air, such as sulphur oxide and nitrogen oxides.
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