How was Frank Sherwood Rowland awarded the Nobel Prize?

Name: Frank Sherwood Rowland. 
Country: United States.
Date of Birth: 28 June 1927.
Died: 10 March 2012.
The subject of Study: Chlorofluorocarbon ozone depletion ozone layer.
Noble Prize Year: Nobel Prize for Chemistry in 1995 for their research on the discovery that chlorofluorocarbons contribute to ozone depletion.