The result of your conversion between microgram/cubic kilometer and grain/quart [US] appears here
To convert between Microgram/cubic Kilometer and Grain/quart [US] you have to do the following:
First divide 1.0E-9/1.0E+9 / ((0.45359237/16)*(192/175)/480)/(0.0037854118/4) = 0.
Then multiply the amount of Microgram/cubic Kilometer you want to convert to Grain/quart [US], use the chart below to guide you.
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