K. Eleftheriadis Dr. Konstantinos ELEFTHERIADIS is a Director of Research at NCSR Demokritos, Head of the Aerosol Group at the Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety. Research expertise on Physicochemical aerosol characterization with respect to climatic active aerosol species, nano-particle metrology, development of novel sampling and measurement techniques for aerosol particles, exposure of humans to aerosol contaminants such as heavy metals and radioactive pollutants, and retrieval of emission source impact, source apportionment and receptor modelling. PI for Demokritos in several EU FP and DG-ENV programmes namely, NICE, SUB-AERO, URBAN-AEROSOL, URBAN-EXPOSURE, EUSAAR, ACTRIS, LIFE+ACEPT-AIR, LIFE+AIRUSE, ITN Marie Curie HEXACOMM, IAEA Regional projects & other National programmes. Coordinator of the FP7 REGPOT-EnTeC for enhancing the capacity of NCSR Atmospheric Research and Technology Infrastructure, including the Athens GAW/ACTRIS Demokritos station, the Mt. Helmos Free troposphere Aerosol and GHG station and the QA/QC physical aerosol properties lab facility.