Acid rain is not pure. It is rain, snow, fog, or any other form of precipitation that has become acidic due to the presence of pollutants like sulfur dioxide and nitrogen oxides in the atmosphere. Pure water has a pH of 7, while normal rainwater has a pH slightly below 5.6. Acid rain, however, has a pH lower than 5.6, making it more acidic than normal rain.
While acid rain doesn't consist of pure acid falling from the sky, it is a form of precipitation that has been contaminated with acidic compounds, making it harmful to the environment.
