above a peninsula of land. the length of the box is 25 km, its width is 80 km, and a radiation inversion restricts mixing to 25 m. Wind is blowing clean air into the long dimention of the box at 0.8 m/s. Between 4 and 6 pm there are 100,000 vehicles on the road, each being driven 60 km and each emitting 6 g/km of CO.
a) Find the average rate of CO emissions during this two hour period
b) Find an estimate of the concentration of CO at 6 PM if there was no CO in the air at 4 PM. (Assume that CO is conservative and that there is instantaneous and complete mixing in the box)