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For the experiment, researchers exposed silverside embryos to the different pesticides for 96 hours, at a concentration of 1 nanogram of pesticide per liter of water.

In a cubic meter of air, there may be only a nanogram of mercury, making it virtually impossible to detect via satellite.

Currently drinking water in the UK is categorised as medium-risk if there are between 10 and 100 nanograms of specific types of PFAS.

And two of 102 surface samples exceeded the Washington state Department of Health decontamination guideline of 15 nanograms per square centimeter.

When fentanyl is used in a medical setting, the average blood concentration in an adult who receives a standard dose is 2.1 nanograms per milliliter, the charges say.