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Question: dust generated from a dirt and gravel road contained 0077...

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Dust generated from a dirt and gravel road contained 0.077% Lead (Pb), 0.0025% Arsenic (As), and 0.37% Iron (Fe). Part A. How many parts per million and parts per billion of As, Pb and Fe is present in the dust? Part B. Which contaminant exceeds EPA limits for metals in residential soils? Part C. If I measure 200 μg/m3 of total dust generated from the road do I exceed the EPA limit for lead in ambient air? (Hint you will need to look up some of these values).

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