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Who visits this site regularly will notice that on an almost daily basis, one or more of the 4200 monitoring stations are out of order and show abnormally high readings. As a consequence isolated violet or red dots on the map are NOT an indication of increased radiological values. Even several violet or red dots near to the same geographical location or near a Nuclear Power Plant is not a certainty of an ongoing accident because they are most likely caused by calibration tests on the related monitoring stations. To reduce the number of erroneous values, several countries do not wish to show their measurement data to the public in real-time and have therefore imposed a delay.