You collect a personal sample to monitor exposure to total dust. Your pump is calibrated to draw 2 liters of air per minute (1 liter=0.001 m^3). You conduct sampling for 4 hours and the lab back to you that the sample you submitted for analysis contained 0.48mg of dust. What was the average concentration of dust in the air? (Show work please)
a. 0.5 mg/m^3
b. 1.0 mg/m^3
C. 2.0 MG/m^3
D. 4.8 mg/m^3