A town is covered by an inversion layer 500 m above the ground. The town’s area is approximately rectangular with dimensions 9 km by 12 km. The incoming air is clean and the wind is blowing at 3 m/s, parallel with the 12 km side of the town. SO2 emissions in the town come from a number of small sources and average 0.0008 mg/m2-s. An industrial plant also emits 2,150 kg/day of SO2. Assume the air above the town is well-mixed. Calculate the state-state concentration of SO2 in the town’s air.