The ozone layer state in the stratosphere over Yakutia depending on the year time is considered. It is shown that the layer thickness is maximum in February-March (450 Dobson's units) and it is minimum in July-September (300 - 350 DU). Measurements indicate that the ozone layer thickness was significantly decreased in the 1990's. A problem of change of ozone layer state is discussed.
@article{arxiv.physics/0510211,
title = {Seasonal Change of the Ozone Layer State over Yakutia},
author = {A. A. Mikhailov and P. P. Ammosov and G. A. Gavrilyeva and N. N. Efremov and S. V. Nikolashkin},
journal= {arXiv preprint arXiv:physics/0510211},
year = {2009}
}