Environmental Protection Agency (EPA) has defined Acid Rain or Acid Deposition as a form of precipitation with acidic compounds such as such as sulfuric or nitric acid that fall on the ground from the atmosphere in wet or dry forms. E.g. rain, snow, fog, hail or even dust that is acidic. Normal rain is slightly acidic with a pH of 5.6 whereas pH of acidic rain generally ranges between 4.2-4.4. The term acid rain was firstly coined by Scottish chemist Robert Angus Smith in 1852, who is also known as the "father of acid rain ." Smith decided on the term while investigating rainwater chemistry near industrial cities in England and Scotland (Refer BaselConvention for transboundary movement of hazardous wastes). He described about this phenomenon in 1872 in the book " Air and Rain: The Beginnings of a Chemical Climatology . " However, it was not given any attention until the late 1950s when scientists in the United States started studying the phenomenon, and in
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