Performance evaluation of Black Carbon portable instruments with an experimental platform in a controlled environment – Alexandre BESCOND, PhD (LNE) the french aerosol conference (CFA 2023) in Paris on March 15, 2023 Traceable calibration of real-time bioaerosol particle counters- Dr. Konstantina Vasilatou (METAS) at IAC2022 in Athens. Field intercomparison of particle counters under winter conditions- Dr. Axel Eriksson (Lund) at IAC2022 in Athens. Performance evaluation of black carbon portable instrument with a laboratory experimental set-up under a controlled environment- Dr. Alexandre Bescond (LNE) at IAC2022 in Athens. 1-year performance test of Soft X-ray charge conditioners- Dr. Ulf Winkler (TROPOS) at IAC2022 in Athens. Reliable quantification of the elemental composition of airborne particulate matter by means of reference-free X-ray spectrometry- Dr. Yves Kayser (PTB) at IAC2022 in Athens. Development and characterization of potential reference samples for TXRF elemental analysis of aerosol particles collected by cascade impactors- Dr. Janos Osan(EK) at IAC2022 in Athens. Yves Kayser (PTB) gave a presentation at EXRS 2022 in Belgium on Traceable chemical analysis of aerosols by reference-free X-ray spectrometry. Prof.Maria Ochsenkühn-Petropoulou presentation in the second EAPE congress, entitled the “Capital of Knowledge”, held in Naples Italy, April 28-30, 2022. Aerosol Science for Atmospheric Quality and Human Health is also published in a special edition of the Hellenic Society of Cardiology. Konstantina Vasilatou of METAS, along with MeteoSwiss, participated at the CEN/TC 264/WG 39 meeting where a new CEN standard on automatic monitors for pollen and fungal spores was agreed. MeteoSwiss gave a presentation on behalf of the AutoPollen programme, and acknowledged the work that is being carried out in the Aeromet II project. Konstantina Vasilatou of METAS presented during the ISO WG9 meeting on “Calibration of bioaerosol monitors with transparent and fluorescent PSL particles” where the Aeromet II project was acknowledged. (October 2020) Christian Wälchli, Kevin Auderset and Konstantina Vasilatou from METAS gave an oral presentation on “Calibration of optical and aerodynamic particle size spectrometers” (September 2020)