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A snoke stack with an effective height of 45 m emits SO2 at a rate of...

A snoke stack with an effective height of 45 m emits SO2 at a rate of 8 kg hr -1. What is the contribution of this stack to ground-level SO2 concentrations at a school yard 950 m downwind, if wind speed is 1.5 m s-1 on a sunny winter day? Assuming unlimited mixing height, and the atmosphere stability is unstable?

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