PTB, CEA, and INRiM are organizing a joint webinar event in the framework of the AEROMET II project. The webinar will focus on the progress of the fabrication of reference materials and X-ray spectrometry methods relevant for aerosol metrology. It will be held on Zoom platform (at this link https://us06web.zoom.us/j/88541579244?pwd=Y0s2ZHl4c0ZMVHlCdEd0Q2pmYWFmUT09) on Wednesday, January 11, 2023, at 2 pm CET.