Аннотация:Wavy spatial variations in the contents of trace gases are identified using plane measurements of O3 concentrations in the medium troposphere and the total content (TC) of NO2 in the atmospheric column from flights above the Subpolar Urals in April 1984. The results of model calculations allow us to relate these variations to mesoscale atmospheric disturbances above the mountains, wich are caused by the influence of dynamic relief on the leaked-in flow.