The article presents the assessment of levels and the pattern of STS air radioactive contamination. Levels of air radioactive contamination with artificial radionuclides at different distances from ground zeros of nuclear tests (0.08-10 km) were determined. The maximum concentration of Pu in the air did not exceed 6.5·10 Bq/m at the crater ridge of the "Atomic Lake", the one at the P3 technical site, the "Experimental Field", reached 1.6·10 Bq/m. Based upon monitoring observation data (2016-2021) on the STS territory, Pu concentration in the air of the "Balapan" and "Degelen" sites varied between 3.0·10 and 1.1·10 Bq/m. In settlements adjacent to the STS territory, Pu concentrations in the air is: Kurchatov t. - 3.0·10 to 6.0·10 Bq/m, the Dolon small village - 4.5·10 to 5.8·10 Bq/m, the Sarzhal small village - 4.4·10 to 1.3·10 Bq/m. Values derived for concentrations of artificial radionuclides at STS observation posts and the adjacent territory are at the level of background values for this region.
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