Dust falls on Chicago at a rate of 65 mg m-2 day-1. Major metallic elements in the

Question:

Dust falls on Chicago at a rate of 65 mg m-2 day-1. Major metallic elements in the dust include Al, Mg, Cu, Zn, Mn, and Pb.5 Pb accumulates at a rate of 0.03 mg m-2 day-1. How many metric tons (1 metric ton = 1 000 kg) of Pb fall on the 535 square kilometers of Chicago in 1 year?