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Problem- (a) Estimate the downwind, centerline, ground-level concentration, at a downwind distance of 4000 meters from the stack, for a non-reactive pollutant which is emitted from a 70-m tall stack at the rate of 40 g/s. The atmospheric stability is Class D, and the wind speed at stack height is 5.0 m/s. The plume rise is 50 m. Use the charts in your Air Pollution Control notes handout. Give your answer in ?g/m3.

(b) Assuming that the answer to part (a) above is exactly 50.0 ?g/m3, what is the concentration at the same downwind distance but at a cross-wind distance of 500 m off the centerline? Give your answer in ?g/m3.

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