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Pollutant concentrations (C/Cref) for the plane of z = 1.1 m under modified ventilation mode with the barrier heights of 0, 40, 60 and 70 cm and pollutant source at point B [(a): height of 0 cm; (b): height of 40 cm; (c): height of 60 cm; (d): height of 70 cm].
