Acid rain is caused by air pollution from industrial . It is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions low pH . It can have harmful effects on plants, aquatic animals and infrastructure . It is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids . It has been shown to have adverse impacts on forests, freshwaters and soils, killing insect and aquatic life-forms as well as causing damage to buildings and having impacts on human health