This article presents the results obtained during the ship borne expedition throughout the water area of Lake Baikal from 29 July to 11 August 2020. We determined the spatiotemporal heterogeneity in the distribution of PAHs and PM10 in the atmosphere above the water area of Lake Baikal. Aerosol above Lake Baikal consisted of submicron particles with the proportion of more than 90% of the total number concentration. The atmosphere above the water area of the northern basin Baikal showed background values of PAHs and high PM10 concentrations. When the wind direction changed from southwestern to northwestern, the PAH concentrations in smoke plumes from wildfires increased in the central and southern basins of Lake Baikal. Among the 21 priority PAHs, phenanthrene, fluoranthene and benzo(b)fluoranthene prevailed in the aerosol. We estimated the degree of atmospheric pollution with benzo(a)pyrene and PM10 standardized in Russia; they did not exceed the average daily MPCs.
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