The main objective of the ACTRIS-ROC project is to strengthen the participation of the Romanian scientific institutions that are part of the ACTRIS-RO consortium in structuring, building and operating the ACTRIS pan-European infrastructure. Romania (through the ACTRIS-RO consortium led by INOE) participates in the pan-European infrastructure ACTRIS (Aerosol, Cloud and Trace finds Research Infrastructure) which was recently included on the ESFRI roadmap as an active project. The ACTRIS-RO Consortium represents 3 regions (Bucharest-Ilfov, North West and South Muntenia) and consists of 2 research institutes classified A+ (INOE) and A (INCAS), and a prestigious university (UBB) which, along with other public and private supporters, signed a Memorandum of Collaboration in this regard. Romania has committed itself politically and financially to contribute to the construction and operation of ACTRIS infrastructure (see attached ANCSI letter), in which it plays an important role through the coordination of the LIDAR Calibration Centre (operated by INOE), but also in which it participates with the observation stations in Magurele, Ilfov (operated by INOE) and Cluj-Napoca (operated by UBB), as well as with the ATMOSLAB airborne exploratory platform (operated by INCAS). All these components are operational at the moment, but require investment in people and equipment to meet the standards required by the pan-European infrastructure ACTRIS, and to successfully participate in its research program. Part of the investments needed for the modernisation of laboratories is covered by research or financed projects from POSCCE:• Project Development of the research infrastructure for disaster management based on high performance computing – MADECIP, financing contract no. 644/12.03.2014, code SMIS – CSNR 48801; • POSCCE-A2-O2.2.1-2013-1 project Development Experimental Base for Atmospheric Environmental Analysis and Research – BECA, financing contract no. 625/11.03.2014, code SMIS-CNRS 48755; • POSCCE-A2-O.2.2.1-2009-4, Airborne Research Laboratory project – ATMOSLAB, financing contract no. 259/28.09.2010, code SMIS-CNRS 14047; • Poc-A.1-A1.1.1 – F-2015 (contract number 152/25.11.2016), projects obtained through competition and currently in progress. However, following the European infrastructure strategy, which is also being developed through the ACTRIS-PPP preparation project (739530 – ACTRIS PPP – H2020-INFRADEV-2016-2017), other investments will be needed in the near future, ensuring a significant participation of Romania in all important actions. These investments are to be supported by future infrastructure projects, to the extent that these opportunities will arise. Through this project, the ACTRIS-RO consortium aims to solve those aspects that are not related to investment in spaces and equipment, but which are crucial for the alignment with the standards of the future European infrastructure ACTRIS. Thus, the project