Acid rain is water vapor, which reacts with airborne acids and then falls to the surface of earth. The primary causes of acid rain are acidic oxides , precisely sulfur dioxide (SO2) and nitrous oxide (NOx- since this can be nitrogen dioxide (NO2) or nitric oxide (NO)) and some carbon dioxide (CO2). Acid rain occurs when these gases react in the atmosphere with water, oxygen, and other chemicals to form various acidic compounds. The result is a mild solution of sulfurous acid, nitric acid, and carbonic acid which then falls onto earth.

Sulfur dioxide, nitrous oxides and carbon dioxide contents in the atmosphere increases by human activity of increasing combustion. Burning fossil fuels such as coal, oil, and natural gas may release sulfur dioxide, nitrous oxides and carbonic dioxide into the atmosphere as a product if the fuel conations sulfur, nitrogen or carbon. In combustion, sulfur is burned with oxygen, which gives the product as sulfur dioxide. In an equation form:

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