Ozone is a conservative indoor air pollutant produced by photocopy machines at a rate of 10 mg/h per machine. The owners of CopyCat reproduction services want to open a new franchise with 30 copy machines in a warehouse that is 12 m (L) X 9 m (W) X 2 m (H) with an air handler capable of turning over 15 m3/h. Assuming the outdoor air has an ozone concentration of 0, calculate the concentration of ozone in the warehouse.