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Pollutant concentrations (C/Cref) at different planes under pollutant source of A with barrier height of 80 cm and under pollutant sources of A1 and A2 with barrier height of 70 cm [(a): planes of x = 2.1 m, y = 3.1 m and z = 1.1 m with barrier height of 80 cm and source of A; (b): planes of x = 2.1 m, y = 0.1 m and z = 1.1 m with barrier height of 70 cm and source of A1; (c): planes of x = 3.3 m, y = 3.1 m and z = 1.1 m with barrier height of 70 cm and source of A2].
