A 2 x 3 sensor array based on pure, Au and CuO modified (two of each kind) WO₃ films was fabricated for enose application. Effect of surface modification has been investigated and correlated with the observed sensor response values. The sensor array was able to detect H₂S, NH₃ and NO selectively based on the sensor response pattern exhibited by the sensor array. WO₃ sensor film modified with CuO exhibited a maximum sensitivity towards H₂S (S = 92, 10 ppm, 250^oC) while pure WO₃ films exhibited better sensing characteristics towards NO (S=2.3, 10 ppm, 300°C) and NH₃ (S=4.5, 50 ppm, 300°C). The shape of the curve remains unaltered by the change in the concentration of the gas. The shape and position of the combined response curve could be used to determine an unknown gas both qualitatively  and quantitatively.