MetNO2 project coordinator Dave Worton chaired a virtual scientific session at the European Geosciences Union (EGU) General Assembly. The session was within the Atmospheric Sciences Divison (AS5.11) and was entitled ‘Atmospheric gases and particles: metrology, quality controlled and measurement comparability’. This session was organized as a collaboration between NPL (Dave Worton, Paul Brewer, Paul Quincey), METAS (Celine Pascale) and the BIPM (Joele Viallon) and provided an excellent forum for the dissemination of outputs from the MetNO2 project to the wider user community.