is a common term for pollution caused when sulfur and nitrogen dioxides combine with atmospheric moisture to produce a rain, snow, or hail of sulfuric and nitric acids. Such pollution may also be suspended in a fog, or the pollutants may be deposited in dry form. Environmental damage from has been reported in northern Europe and North America. High levels of have also been detected in other areas of the world, such as above the tropical rain forest of Africa. has destroyed plant and animal life in lakes, damaged forests and crops, endan ....