How was Paul J. Crutzen awarded the Nobel Prize?

Name: Paul J. Crutzen. 
Country: Netherlands.
Date of Birth: 3 December 1933.
Died: 28 January 2021.
The subject of Study: Ozone depletion.
Noble Prize Year: Nobel Prize for Chemistry in 1995 for their research on atmospheric chemistry and specifically for his efforts in studying the formation and decomposition of atmospheric ozone.