The Advisory Group for the “UN/OECD online seminar in follow-up to the 2020 Beirut port explosion: Lessons learned, experiences and good practices of ammonium nitrate storage and handling, and related accident prevention, preparedness and response” convened for the first time to provide expert advice on the organization of the seminar. The Advisory Group is comprised of members nominated through the UNECE Industrial Accidents Convention’s Bureau, in the UNECE Sub-Committees of Experts on the Transport of Dangerous Goods and the Globally Harmonized System of Classification of Labelling of Chemicals, and the Bureau of the OECD Working Party on Chemical Accidents.