A nasty gaseous air pollutant is emitted at a rate of 39.8 kg/s from IPollute Chemical's main stack near Minneapolis. The conditions on a certain day are: It is night Clouds cover approximately 65% of the night sky The average wind speed is 3.36 m/s blowing directly from west to east. There is concern about the air quality at a highly populated downwind location 2.06 km east of the plume. The location of concern is not exactly along the centerline of the plume, but at y = 40.8 m off the plume centerline horizontally and at z = 32.8 m below the plume centerline vertically. Calculate the mass concentration of this chemical at the location of concern in units of mg/m3