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Rain, snow, or any other deposition of water with an acidity greater than normal. As water falls through the air it absorbs carbon dioxide and forms carbonic acid, which has a pH of about 5.6. Higher acidity in rain or snow is observed downwind (often at significant distances) from areas with many large sources of the air contaminants sulfur dioxide and nitrogen dioxide. These oxides react with water to form sulfuric and nitric acids. Long-term deposition of these acids is linked to adverse effects on aquatic organisms and vegetation in geographical areas with poor buffering capacity within the sediments. Exposure to acid deposition also deteriorates marble and limestone buildings and statuary.
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