Abstract
The results of ground-based and satellite spectroscopic measurements of the tropospheric NO2 content near St. Petersburg in January–March 2006 are presented. It is shown that the increased concentrations of NO2 observed in St. Petersburg and its vicinities in this period were caused by NO2 accumulation due to unfavorable weather conditions, which is confirmed by an analysis of meteorological data and the results of a numerical simulation of the dispersion of urban air pollutants. Data from satellite and ground-based measurements agree with each other satisfactorily (a correlation coefficient of 0.5) and with model calculations of tropospheric NO2 conducted for the coordinates of a station of ground-based measurements (a correlation coefficient of 0.6). The HYSPLIT dispersion model also made it possible to estimate the scale of the NO2 spatial-temporal variability in the near-surface layer in the vicinities of St. Petersburg.
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