The City of Leadville (dimensions 120 * 120 km ) is characterized by an average daily emission rate of 4700 kg/d of particulate lead into the atmosphere from auto exhaust and industrial processes. The background concentration of atmospheric lead is .08 ug/m63 . During a typical hot day in Leadville the mixing height is 480 m and the average wind speed is 1.9 m/s . A typical lead particle deposition flux, J , for similar meteorological conditions is .04 cm/s .
What is the steady-state concentration of lead in the urban air?