Air pollution Air pollution Acid precipitation
Acid precipitation is precipitation, like rain, sleet, or snow, that contains acids from air pollution. When fossil fuels are burned, they let out oxides into the air. When these oxides mix with water in the atmosphere, they make acid, which fall as precipitation. Acid precipitation can kill living things, like fish and trees, by making the place where they live too acidic. Acid rain can also damage buildings made of limestone and concrete.