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A simple way to model air pollution over a city is with a box model that assumes complete mixing and limited capability for the pollution to disperse horizontally or vertically except in the direction of the prevailing winds (for example, a town located in a valley with an inversion layer above it). Consider a town having an inversion at 250m, a 20km horizontal distance perpendicular to the wind, a wind speed of 2m/s, and a carbon monoxide (CO) emission rate of 60kg/s (see attached image). Assume the CO is conservative and completely mixed in the box. What would the CO concentration be in the box?
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C =? Wind 2 m/s 2 m/s 250 m 60 kg/s of CO 20 km
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Determine the CO concentration in the b...
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COinput rate CO output rate 100 mg20km x- 10' m -x 250m x 2m/s x CO, 1km mg/m 60kg/sx 1kg conc 100 mg 60 kg/s x 1kg CO conc 10,000 x10 m3/s 6 mg/m3 CO conc
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