When the ATMO-ACCESS project and its training component in WP4 were devised, the reduction of the environmental footstep related to these trainings, mostly performed by physical access, was a very strong driver to develop further TNAs in a more sustainable way. However, during the recent Covid-19 pandemic new remote access tools (such as Zoom, Webex and MS Teams) became so popular within the research community, that also other issues such as spending less time travelling and the combination of research and family life became an issue. This has been the incentive for producing two reports on TNA for training activities: First, TNA and training related to physical access and second, TNA and training related to remote access.Transnational access (TNA) has been used within several European atmospheric research projects (e.g. ACTRIS, EUROCHAMP) to facilitate measurement campaigns, to foster knowledge exchange and to support the education of early career scientists on the European scale. In fact, many international measurement campaigns would not have taken place without this instrument for transnational support in place. The training component has always been a critical focus of the TNA provision, especially for young scientists. In the past, TNA was very much related to physical access, where, for example, several instruments from different institutes were installed at a specific location and scientists related to the respective instruments have supported the data production. Furthermore, also physical access to training schools has been a popular subject of past TNAs.Within this report, the existing training schemes in the atmospheric domain related to remote access will be discussed. This report on remote access is accompanied by a report on physical access. Both reports have mostly the same structure and at the end an identical conclusion section. The basis of both reports is a questionnaire, which was used to gather information on past physical and remote access training. This was sent to the entities of ACTRIS/EUROCHAMP, ICOS and IAGOS, which have offered TNA related to training in the past. Furthermore, these entities were asked about their future plans, related to physical and remote training within TNA, which are also summarized in the reports.The outcome of this report, together with the report on physical access, will be used to devise specific calls to test new ways of training within the TNAs. This will then build the basis for future trainings related to TNAs within the atmospheric research community and potentially for TNAs in projects within other environmental compartments.