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Acid Rain Why is Acid Rain Caused by Human Impact? Acid rain is any precipitation that is acidic in nature. Rain is already slightly acidic in nature because as it falls, it dissolves some of the carbon dioxide in the atmosphere and falls as very dilute carbonic acid. This is not significantly harmful to the environment Even though the concentration of Nitrogen oxides and sulphur oxides (which are the main causes of acid rain), are much less than the concentration of carbon dioxide in the atmosphere, the former gases are much more soluble and therefore have a much greater effect on the acidity of the precipitation. Liquid acid rain is dissolved in the rain and are carried a long distance before they fall. Dry depositions simply fall near to the source. Sulphur dioxide is responsible for 60-70% of acid rain worldwide. Of this, approximately 90% is the result of...

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