Imagine looking out the window in the morning and only being able to see a few blocks. It is not snow that you see neither is it heavy rain. It appears to be fog, but not regular fog, it is a harmful, acidic and ugly fog that is a result of very bad air pollution. This is true on some days in Mexico City. Mexico City is one of the most polluted cities in the world and the mountains that surround the city hold the thick and ugly fog in. Acid rain has been known to fall in this city and many others around the world. Acid rain is one the biggest problems our environment deals with today. What is acid rain? Where does it come from and how does it form? What are the effects of it on our environment and us? In this report I will teach you all you need to know about acid rain and what we can do about it.
             What is Acid Rain?
             Acid rain is defined as rain that has more acid in it than the normal amount. Acidity is measured on the pH scale that runs from 0 to 14. Anything from zero to seven is considered acidic, seven is neutral and anything from 7 to 14 is basic. Something that has a pH of 6 is ten times more acidic that something with a pH of 7. There is a lot of controversy over what the pH of rain must be to be considered acidic. Anything equal to or lower than 5.6 on the pH scale has been said to be acidic but that number is subject to change depending on who you talk to or where you live.
             Acid rain in found in places around the world. The sad thing is that the cities that create all the pollution don't suffer from it, it's the areas around the source of the pollution. Some of the main countries affected severely by acid rain include Brazil, Canada, China, France, Japan, Mexico, US, Norway, Sweden, and Switzerland. Switzerland is one of those
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