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This paper investigates a new test method to assess the photocatalytic activity of plasterboards coated with a TiO2 dispersion under real-world conditions. The degradation of nitrogen oxides NOx (NO and NO2) is studied and the photocatalytic efficiency under UV illumination is evaluated in a 10-m3 room after a constant gas injection. Two ultrafine TiO2 dispersions are used: 0.85% TiO2 and 5% TiO2,...