Acid rain is more acid than normal. Natural rain and snow is slightly acidic (pH 5.6) because of the carbon dioxide (CO2) dissolved in it. But over recent decades, rain in North America and Europe downwind of industrial areas has had a pH close to 4.5 and sometimes as low as 2.1(same as lemon juice). Also the acid rain is the result of sulfur dioxide (SO2) and nitrogen oxides (NOx) reacting in the atmosphere with water and returning to earth as rain, fog, or now. Broadly used to include both wet and dry deposition.
The two primary sources of acid rain are sulfur dioxide (SO2), and oxide of nitrogen (NOx). Sulfur dioxide is a colourless, prudent gas released as a by-product of combusted fossil fuels containing sulfur. Sulfur dioxide can al
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