Aerosol pollution of the atmosphere at southeastern coast of Lake Baikal during of wildfires in Siberia

Comprehensive studies of aerosol pollution in the atmosphere were conducted at “Boyarsky” scientific station from spring to autumn 2024. The results of expeditionary work revealed the impact of smoke aerosol on the air quality at “Boyarsky” station, transported from both western and eastern directions. The highest concentrations of aerosols PM2.5 up to 42 µg/m³ and PM10 up to 104.4 µg/m³ were recorded from July 31 to August 1, as well as on August 16 and 20, 2024, due to the transport of smoke aerosols from wildfire areas in the Irkutsk region, the Republic of Buryatia, and Yakutia. During the same study, measurements of the number concentration of submicron aerosol (SMA) were conducted. The measurement results showed that from August 16 to 24, 2024, the temporal variation in the number concentration of SMA mirrored the variation in the mass concentration of PM2.5 and PM10 aerosols at “Boyarsky” station. A sharp increase in the number concentration of submicron aerosol up to 150 cm⁻³ and the mass concentration of PM10 up to 95 µg/m³ during daytime hours indicates the transport of smoke aerosol.