Acid Rain or Acid Deposition is a rain or any other form of precipitation that is unusually acidic and possesses high level of hydrogen ions (low pH), and contains large amounts of harmful chemicals such as sulfuric or nitric acid. The Acid Rain falls to the ground from the atmosphere in wet or dry forms within the rain, snow, fog, hail or even dust that is acidic, and caused by emissions of sulphur dioxide and nitrogen oxide, which reacts with the water molecules in the atmosphere to produce acids. It can have harmful effects on plants, aquatic animals, and infrastructure as a result of burning substances such as coal and oil.

Related Definitions in the Project: The HSE Management