At Chernobyl NPP industrial site routine monitoring of volumetric activity of 137Cs (Cesium-137) in air samples is constantly performed by the stationary control station. The volumetric activity of 137Cs in the sample of ambient air is within the range not exceeding the maximum values for 2014 and the 1st quarter of 2015.

Since April 27, 2015, the personnel of the radiation monitoring laboratory in ChNPP RSS started a sampling using the portable sampling equipment additionally to the scheduled radiation monitoring. The results of the express measurements show, that the volumetric activity in air samples is at the level of minimum-measured activity. Exceedance of the control levels is not fixed. Confirming the results obtained on the basis of the data of stationary radiation monitoring system - component of the Integrated Automated Monitoring System (IAMS). This system allows monitoring of nuclear and radiation safety of the Shelter object and the surrounding areas, including the state of the main building structures and seismic activity, in real-time.