Convert micrograms per square foot to ppm or mg per liter

Convert micrograms per square foot to ppm or mg per liter (06/03/2013, 12:13 AM)

I found a product for lead paint that says it reduces the amount of lead to a certain mg/L.
The EPA measures lead paint hazard as micrograms per square foot. How do I compare them?

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06/03/2013, 12:13 AM	Convert micrograms per square foot to ppm or mg pe...