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Acid Rain What is Acid Rain? Acid rain is the term used to describe the deposition of acidic air pollution. Although some air pollutants fall directly back to Earth, a lot of them return in rain, snow, sleet, hail, mist or fog, hence the term "acid rain". All rain is slightly acidic as it contains carbon dioxide, a gas found in air. Unpolluted rain usually has a pH of between 5 and 6. Acid rain has been found to have a pH as low as 3 and in some cases even lower. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Acid Neutral Alkali What Causes Acid Rain? When power stations, factories, houses and cars emit pollution into the air, it contains chemicals like sulphur dioxide and nitrogen oxides. These chemicals may either fall directly back to the Earth due to gravity, these are called dry deposition, or they may mix...

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