The ATMO-ACCESS is the organized response of distributed European atmospheric research facilities for developing a pilot for a new model of Integrating Activities. ATMO-ACCESS will deliver a series of recommendations for establishing a comprehensive and sustainable framework for access to distributed atmospheric Research Infrastructures (RIs), ensuring integrated access and optimal use of the services provided. Several access modalities (physical, remote and virtual access) are tested. The main challenge is the development of strategies to engage different user communities (academia, public and private sector), by identifying their needs, establishing targeted communication of the access offered, and evaluating the adequacy of ATMO-ACCESS.