The urban air above the city of Toronto if the mixing height above the city is 1210 m, the width of the box perpendicular to the wind is 105 m, the average annual wind speed is 15,400 m/hr, and the amount of sulfur dioxide discharged is 1375 106 lb/yr.

1. Sketch a diagram to represent the system. ?

.2. Write the complete mass balance for SO2 ?.