April 30, 2021 NTUA published together with BAM, EK, Bruker Nano GmbH, UNICAS, NPL, NILU, LNE and PTB have publish Quantification of Element Mass Concentrations in Ambient Aerosols by Combination of Cascade Impactor Sampling and Mobile Total Reflection X-ray Fluorescence Spectroscopy. The paper can also be found on Papers page.