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Airflow distributions at the planes of x = 3.3 m and y = 3.1 m with the barrier heights of 0, 40, 50, 60 and 70 cm under modified ventilation mode and pollution source of B [(a): height of 0 cm; (b): height of 40 cm; (c): height of 50 cm; (d): height of 60 cm; (e): height of 70 cm].
