The combination of sulfur dioxide, nitrogen dioxide and atmospheric moisture creates acid rain. Acid rain is an end-product of air pollution from factories and industrial plants. The polluting gases from these industries such as nitrogen dioxide and sulphur dioxide reacts with the droplets of water in the clouds that results to the formation of nitric and sulphuric acid. The rain coming from these clouds with nitric and sulphuric acid falls as very weak acid which is popularly known as the acid rain.
