Question: W u Problem 9 (20). In the well mixed urban airshed shown at right, there is an area L W-L-20 km particulate matter (PM) emission

W u Problem 9 (20). In the well mixed urban airshed shown at right, there is an area L W-L-20 km particulate matter (PM) emission source SPM H-1 km (Spm) and a sink due to settling (settling u- 1 km/hr velocity vs). The wind velocity is u; there is HO SPM-5 kg/km/hr no PM in the air coming into the urban area. V. -0.05 km/hr a) Write the steady state mass balance equation, then solve for PM concentration. I b) Downwind of the airshed in part there is no source emission (SPM = 0) but still chemical reactions occurring. These chemical reactions are converting SO2, a gas, to sulfate (SO) particulate matter (PM). The SO2 level leaving the city is 10 ppbV (-27 ug m), and reacts at the rate of 2%/hr. Modeling the air as it moves downwind as a plug flow system, write the PM mass balance equation, then solve for the PM concentration 5 hrs downwind. The PM still settles during transport. m

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