March 3, 2023 PTB, CEA and INRiM organized a joint webinar. The webinar took place on the platform Zoom in January 2023. It was advertised among a public external to the consortium in academia and industry and 23 people attended. Three speakers from PTB, CEA and INRiM discussed the recent progresses on the realization of reference materials and on the X-ray spectrometry methods relevant for aerosol metrology. Further details here.