America
In the United States there is a high frequency of acid rain. This is due to the number of factories putting out the sulphur dioxide, nitrogen oxide and nitrogen dioxide into the atmosphere. There is also a large number of power plants releasing sulphur dioxide. Also in the same region Canada experiences frequent occurrences of acid rain due to the number of factories in the south-eastern part of Canada. It is also estimated that Canada is affected by acid rain due to the number of motor vehicles on the road that is putting out nitrogen oxide and nitrogen dioxide. In the United States they have a large risk of acid rain because the sulphur dioxide content in coal is much larger and increasing the amount of sulphur dioxide being released.