Surface ozone measurements within the industrial city limits during the polar winter period

摘要

Abstract: Surface ozone measurements within the city limits are presented. Measurements have been performed by a chemiluminescence ozonometer at various sites of industrial and residential areas and in the suburbs as well. The background ozone level is 15 - 25 ppb. Weak diurnal variation is observed. Decremental O$-3$/ concentrations in the city are in some tens of percentage in the winter period. The urban plume is extended at least up to 10 km from the city limits. !23