The aircraft was on a scheduled passenger service from Cardiff Airport, UK (EGFF) to Dublin Airport, (EIDW). During its final descent towards EIDW, the Flight Crew noticed a burning smell, which they described as “sulphurous”. The Commander contacted the Cabin Crew, who informed him that they had also noticed a smell. The Commander noted that the smell appeared to be getting more intense.The Flight Crew donned their oxygen masks, which had integrated smoke goggles, and declareda PAN-PAN (state of urgency) to Air Traffic Control(ATC). During the approach the Flight Crew experienced difficulties communicating with each other and ATC. They also experienced restricted visibility through the smoke goggles. The aircraft continued its approach and landed safely at EIDW, where it was met by the emergency services. There were no injuries.