The result of your conversion between microgram/litre and pound/gallon [US] appears here
To convert between Microgram/litre and Pound/gallon [US] you have to do the following:
First divide 1.0E-9/0.001 / 0.45359237/0.0037854118 = 0.00000001
Then multiply the amount of Microgram/litre you want to convert to Pound/gallon [US], use the chart below to guide you.
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