Coal based power plant is situated near a township having average building height of 20 m. Coal is burning at a rate of 5.0 ton/h as fuel contains 5.0% sulfur and 20.0% ash. Half of ash is emitted with flue gases at 150 C and velocity of 35 m/s. Inner diameter of stack is 20 m. At the point of emission, temperature is 10 C, pressure is 1000 millibars and wind velocity is 15 m/s. Find downwind ground level concentration at the distance of 1.5 km if crosswind dispersion coefficient is 210 m and for vertical is 160 m.

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