An average adult breathes about 8.50 × 103 L of air per day. The concentration of lead in highly polluted urban air is 7.0 × 1026 g of lead per one m3 of air. Assume that 75% of the lead is present as particles less than 1.0 × 10−6 m in diameter, and that 50% of the particles below that size are retained in the lungs. Calculate the mass of lead absorbed in this manner in 1 year by an average adult living in this environment.
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