V2: Following the final external review, the deliverable was corrected according to the recommendations. This document delivers the final assessment of the TransNational Access (TNA) provided during the ATMO-ACCESS project (Solutions for Sustainable Access to Atmospheric Research Facilities). Previous Deliverables D9.1 “First assessment of TNA provided to ATMO-ACCESS facilities”, D9.2 “Second assessment of TNA provided to ATMO-ACCESS facilities”, and D9.3 “Third assessment of TNA provided to ATMO-ACCESS facilities” contain extensive information on the TNA activities carried out during successive one-year periods since the project's start. This report covers the overall physical, remote and hybrid access provision to users by the 61 European atmospheric research facilities of the ACTRIS, ICOS, and IAGOS RIs throughout the entire project duration, from October 2021 to April 2025.