The pH of acid rain is:

Acid rain has a pH value of less than 5.6, which is more acidic than normal rainwater. Normal rainwater has a pH of around 5.6 due to the natural presence of carbon dioxide, which forms weak carbonic acid. Acid rain is primarily caused by the emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) from industrial activities and vehicles. When these pollutants mix with water vapor in the atmosphere, they form stronger acids such as sulfuric acid (H2SO4) and nitric acid (HNO3).