A321
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Confusion; Situational Awareness
Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
General None Reported / Taken
Aircraft
More research should be done to understand why these fume events are occurring and what can be done to prevent it.
A321 First Officer [FO] reported a fume event during arrival descent. Additionally; FO requested more research  of events to determine cause and develop prevention.