3. Sulfur dioxide is being emitted in a rural area at a rate of 0.90 kg/s from a

Question

3. Sulfur dioxide is being emitted in a rural area at a rate of 0.90 kg/s from a stack with an effective stack height of 220m. The average wind speed at stack height is 4.8 m/s and the stability category is B. Determine the short-time period, downwind, center-line concentration in micrograms per cubic meter at ground-level distances of 1.0, 2.0 and 4.0 km.

4. What is the expected short-term period ground-level concentration at 150 and 250 m away from the downwind center line for the conditions given in Problem 3?

Explanation / Answer

Short period

t1 = 1000 / 4.8 = 208.33 s
t2 = 2000 / 4.8 = 416.67 s
t3 = 4000 / 4.8 = 833.33 s

The downwind:
d1 = 1000 - 220 = 780 m
d2 = 2000 - 220 = 1780 m
d3 = 4000 - 220 = 3780 m

Short term period at ground level concentration at 150:
t1 = 150 / 4.8 = 31.25 s
t2 = 250 / 4.8 = 52.08 s

I have a doubt with the concentration, but here's the other.

Hope this helps

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