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Acid rain is not just rain as the name would suggest, but any form of precipitation with acidic levels below, as a guideline, 5.6pH (remember the lower the pH, the greater the acidity). 5.6pH is given as a guideline because this would be the pH of carbonic acid rain in average CO2 air conditions. However there are other gases that cause different types of acid rain, and some cause lower pH levels than this. This is why most people have now ditched the '5.6 or lower pH is acid rain' concept. In actuality, acid rain is rain with a pH that is unusually low compared to it's surrounding because it has acid in it. Acid rain is caused by water in any state (solid, liquid or gas) picking up gases such as nitrous oxide, carbon dioxide and sulphur dioxide in any stage of the hydrological cycle. What matters is that...

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