Acid rain is caused by excess of carbon dioxide in air
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Because carbonic acid is a relatively weak acid, the ability of carbon dioxide alone to generate true “acid rain” is very limited. Acid rain is caused by industrial emissions of sulfur dioxide and nitrogen oxides (which form much stronger acids when equilibrated in rainwater).
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The atmosphere makes all rain slightly acidic because carbon dioxide and water combine to form carbonic acid, commonly known as carbonated water. The pH of normal rainwater ranges from 5.5 to 5.6, while most acid rain has a pH value of 4.0 to 4.6.
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