6.20.* It is estimated that a burning dump emits 3 g/s of NO,. What is the concentration of NO, directly downwind from this source at distances of 0.5, 1, 3, and 5 km on an overcast night with a wind...

solve 6.21!

Extracted text: 6.20.* It is estimated that a burning dump emits 3 g/s of NO,. What is the concentration of NO, directly downwind from this source at distances of 0.5, 1, 3, and 5 km on an overcast night with a wind speed of 7 m/s? Assume the dump to be a ground-level point source with no plume rise. 6.21. The owner of the dump in Problem 6.20 suggests things would be much better if a 20-m stack were erected on the dump; it could then be considered a point source at an elevation of 20 m. Repeat Problem 6.20 for this condition. Is the owner right?