The research studies the unfavorable meteorological and synoptic situations contributing to an increase in the concentration of sulfur dioxide (SO2) and carbon monoxide (CO) in the air basin of the Southern Baikal region. Atmospheric impurities and meteorological parameters were registered at the Listvyanka station with SV-320 and R310-A chemiluminescent gas analyzers, as well as a Meteo-2M ultrasonic weather station. General synoptic processes over the region were studied using the Digital Atmosphere software and the HYSPLIT trajectory model. The influence of various meteorological conditions on the atmospheric air over the Listvyanka station in 2020 and 2021 was determined.

This study demonstrates a comparative analysis of surface and satellite measurements. The average concentrations of PM2.5 and CO, SO2, measured at the Listvyanka station located on the coast of Lake Baikal, were considered. Satellite measurements data (Copernicus Sentinel-5P) were recomputed based on the SILAM model. A joint analysis of data showed that satellite measurements were suitable for a spatial description of regional air pollution. The computed maxima coincided with the surface measurements in terms of time periods and general monitoring results. However, at extreme increases in concentrations of pollutants, a significant difference in the numerical values was registered. Satellite monitoring data confirmed the relationship between the increase in PM2.5 and CO concentrations in the air basin at the Listvyanka station and the transfer of smoke plumes from intense forest fires located at a distance of 1,500 – 2,000 km.