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At the present moment Cosmic Ray Laboratory of Polar Geophysical Institute has a row of gamma-ray detectors. There are six points of gamma-ray monitoring: Barentsburg (arch. Spitsbergen, 78º N), Tixie (arctic shore of Laptev sea, 71º N), Apatity (68º N), Yakutsk (62º N), Houlougay peak (Sayan mountains, 3000 m, 52º N), Rostov-on-Don (47º N). The employed detectors are the same and tested by the known characteristic lines of some elements. Also the detectors are in lead shield opened from top. A new phenomenon was carried out on each station. This is an increase event of gamma-rays coming from the atmosphere. The events are accompanied by precipitations, they occurred in any season. The increase amplitude is up to 60 %. Extended experiments on Apatity and Barentsburg stations proved an absence of radionuclide contamination in the precipitations. Also at these stations the gamma-ray detectors are incorporated with charged particle detectors. There is no increasing on charged particle detectors during precipitations. Especially increase events on Barentsburg and Houlougay peak are important. These stations are in uninhabited areas and far from industrial zones. In this work common features of the events and common conclusions concerning the events are present.