The aim of this work was to determine the extent and character of the influence of Norilsk industrial center on the regional air basin. This problem was solved with the aid of the Optik-E flying laboratory (An-30 aircraft). It turned out that in the urban column the pollutants are mostly transported in the gaseous form, because the aerosol fraction deposits in the form of coarse particles just near the source. Gaseous pollutants spread to significant distances under the inversion layer (in the 300-400 m layer during the experiment). During the airborne experiment, we managed, for the first time in the past 15 years, to observe the gas-to-particle transition in the plume emitted from an industrial center. This process started 6 hours after the pollutants were emitted into the atmosphere and proceeded at the distance of 50 km from the point where the condensation began. Sulfurous anhydride was the main precursor gas. The estimates have shown that the deposition of sulfates formed in the plume can achieve 281 t/(km2 year) in the region, where this process proceeds.