from air waste a book (dispersion of pollutants in the Atmosphere).

i am need answer the second Quastion.

this Quastion/

What is the expected short-time period ground-level concentration at (a) 150 m and (b) 250 m away from the downwind center line for the conditions of Problem 1 for cases (a) through (h)?

1- Sulfur dioxide is being emitted in a rural area at a rate of 0.90kg/s from a stack with an effective height of 220m. The average wind speed at stack height is 4.8m/s and the stability category is B. Determine the short-time period, downwind, centerline concentration in micrograms per cubic meter at ground-level distances from the stack of (a) 0.6, (b) 0.8, (c) 1.0, (d) 1.2, (e) 1.6, (f) 2.0, (g) 3.0, and (h) 4.0km. Plot C versus the logarithm of the distance. 2. What is the expected short-time period ground-level concentration at (a) 150m and (b) 250m away from the downwind center line for the conditions of Problem 1 for cases (a) through (h)