Rain with elevated levels of hydrogen ions is considered to be acid rain. Acid Rain is caused by the emissions of sulfur dioxide and nitrogen oxides which react with the water molecules. The acid in the rain is harmful to plants, animals and infrastructures.
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Sulfur Dioxide and Nitric oxides are the two primary chemicals associated with acid rain.
The acidity in acid rain is caused by the levels and relationships between the two chemicals and the water vapour, as well as several other factors.
The main contributor towards acid rain is the burning of fossil fuels.
As you can see in this diagram, acid rain has a large pH bracket and the effects are devastating.
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