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The City of Leadville (dimensions 120x120km ) is characterized by an average daily emission rate of 5000kg/d of particulate lead into the atmosphere from auto exhaust and industrial processes. The background concentration of atmospheric lead is 0.1 ug/m^3. During a typical hot day in Leadville the mixing height is 500m and the average wind speed is 1.9m/s. A typical lead particle deposition flux,Jd , for similar meteorological conditions is 0.05cm/s .
a)What is the steady-state concentration of lead in the urban air?
(Hint: note that the mass flow rate of Pb Particles from the air and to the earth (mass of Pb deposited/time) is given by Qd x C, where ,Qd=Jd x A, C is the concentration of lead in the air above the city, and A is the surface area of the city)
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