Acid Rain Acid rain is a form of air pollution which is the cause of a lot of environmental damage now and in the past. It is formed when oxides of sulfur and nitrogen combine whith atmospheric moisture in a result it forms sulfuric (so2) and nitric (Nox) acids. What acid rain affects when it hits the surface is a lot, for example acid rain kills more than 600 million trees a year. Also in Northern Europe acid rain has worn away buildings, killed crops, and threatened to polish off the fish life in freshwater lakes. Also, it has damaged 34 percent of West Germany's forests. In the united states it has contaminated the Ohio rive valleys and may other mid Atlantic sta