A thermal power plant emits SO2 at the rate of 500 × 108 μg/s. Its stack has an effective height of 200 m where wind speed is 5.0 m/s. If the horizontal and vertical dispersion coefficients are 400 m and 200 m, respectively, the downwind ground level concentration of SO2 at a distance of 2 km will be
1
24124 µg/m3
2
∼ 206.5 µg/m3
3
∼ 75.8 µg/m3
4
∼ 180.6 µg/m3