A smoke stack emitting 75 g/s of CO2 has an effective stack height of 250 m. The windspeed is 4 m/s at 10 m, and it is a clear summer day with the sun nearly overhead. Estimate the ground-level CO2 concentration a. directly downwind at a distance of 2 km (in g/m3). b. at the point downwind where CO2 is a maximum (in g/m3). c. at a point located 2 km downwind and 0.1 km off the downwind axis (in g/m3). What if there was another smoke stack with an effective stack height of 100 m located at a downwind distance of 600 m from the 1st stack. The 2nd smoke stack is also emitting CO2 at the same 75 g/s rate and all other air conditions remain constant. Calculate the overall ground level concentration 2 km downwind (from the second smokestack) on the center line