Robert Angus Smith FRS (15 February 1817 – 12 May 1884) was a Scottish chemist, who investigated numerous environmental issues. He is known for his research on air pollution in 1852, in the course of which he discovered what came to be known as acid rain. He is sometimes referred to as the 'Father of Acid Rain'.Hamlin, C. (2004) "Smith, (Robert) Angus (1817–1884)", Oxford Dictionary of National Biography, Oxford University Press. Retrieved 10 August 2007 (subscription required)
