Physical parameters included Ten-minute-averaged ambient dose equivalent rates (nSv/h) observed by the Immission Monitors for Ring area (IMR stations) at the sites of the SCK CEN and the Doel NPP for selected periods in time Geographic locations Belgian Nuclear Research Centre (SCK CEN) in Mol, Belgium: 18 IMR stations Nuclear Power Plant in Doel, Belgium: 16 IMR stations Periods 6 through 13 August 2022 30 August through 1 September 2022 10 through 12 September 2022 Description of data The zipped folder contains three sub folders for the different periods of interest. Each sub folder contains 34 files. Files are either named IMR-D##.txt to indicate Doel-based or IMR-M##.txt to indicate SCK CEN-based stations. Exact locations (WGS84) are included in the headers. Time stamps (referred to as 'local_time' in the files) are given in Central European Summer Time (UTC+2), and the ambient dose equivalent rates (referred to as 'value' in the files) in nanosievert per hour (nSv/h). Acknowledgements The authors thank François Menneson from FANC-ACFN for providing access to the Telerad data.