The charge tempers celebrations after City advanced to a first Champions League semi-final with a 3-2 aggregate win over PSG.
A statement from UEFA read: "Disciplinary proceedings have been opened following the UEFA Champions League second-leg quarter final between Manchester City FC and Paris St Germain (1-0) played on April 12 in England.
"Charges against Manchester City FC: - Setting off of fireworks - Art. 16 (2) of the UEFA Disciplinary Regulations.
"This case will be dealt with by the UEFA Control, Ethics and Disciplinary Body on May 19."
Source: PA