Question: what is the difference between ng/l and ug/l?
Answer: The answer is 1. We assume you are converting between microgram/liter and nanogram/millilitre. You can view more details on each measurement unit: ug/L or nanogram/millilitre The SI derived unit for density is the kilogram/cubic meter. 1 kilogram/cubic meter is equal to 1000000 ug/L, or 1000000 nanogram/millilitre.