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This article presents the results obtained during the expedition on board the research vessel throughout the water area of Lake Baikal from 1 to 9 September 2021. We determined the spatiotemporal heterogeneity of the distribution of polycyclic aromatic hydrocarbons (PAHs) and sub-10μm particulate matter (PM10) in the atmosphere above the water area of the lake. Local sources of air pollution along the lake coast and synoptic conditions affected the changes in the concentrations of pollutants. Elevated concentrations of PAHs and РМ10 were recorded near the Nizhneangarsk settlement in the northern basin, at the estuary of the Selenga River in the central basin as well as along the east coast and at the estuary of the Angara River in the southern basin of Lake Baikal. During the observations, the proportion of submicron particles at different sites of the lake water area decreased to 35-29 % of the total number concentration. Among the priority PAHs, fluoranthene > pyrene > benzo(b)fluoranthene predominated in the aerosol. Cyclones operating above the region, which were accompanied by precipitation and intense winds, led to the purification of the atmosphere and a decrease in the concentrations of the studied elements.
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