Acid Rain is defined as the precipitation of acid in the form of rain. When atmospheric pollutants like oxides of nitrogen and sulphur react with rainwater and come down with the rain, this results in Acid Rain. The causes of acid rain are Sulfur and Nitrogen particles which get mixed with the wet components of rain.
The two strong acids present in the acid rain are nitrogen oxide and sulphur dioxide. These two gases react with water in the atmosphere and oxygen in the air to form sulphuric acid and nitric acid.