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Smog chambers are widely used to investigate atmospheric aging of combustion aerosols. To the best of our knowledge, the Large Aerosol Chamber (LAC) in Tomsk (Russia) with a volume of 1,800 m3 (25 m length, 10 m diameter) refers to one of the largest smog chambers in the world. The LAC contains two ovens enabling the generation of combustion aerosols under flaming and smouldering conditions. (Popovicheva et al., 2016). In the following, we describe the upgrade of the LAC to “PHOTO-LAC”, enabling studies of photochemical plume aging, and a set of characterization experiments.