Abstract
The methods are described and the results of long-term measurements of the total NO<sub>2</sub> and O<sub>3</sub> column content at the Zvenigorod Scientific Station and the Kislovodsk High-Altitude Scientific Station of the A. M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, are discussed. Annual and seasonally dependent estimates of long-term trends and interannual variations of the species under the influence of circulation factors and oscillations in t solar activity are obtained. The differences and common features of the temporal evolution of NO<sub>2</sub> and O<sub>3</sub> have been revealed. The important role of atmospheric circulation in long-term and interannual changes in the species contents is noted. The obtained estimates of linear trends are compared with the trends of the total NO<sub>2</sub> and O<sub>3</sub> content in other regions. Changes in the NO2 content under due to the 11-year solar cycle are compared with the results of numerical modeling.
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