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What is 0.3 ppb?

Updated: 9/18/2023
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13y ago

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Parts per billion is abbreviated as ppb - it could refer to anything as it's not restricted to a specific unit of measurement but generally speaking it's used in water and air quality type situations.

Although ppb is pretty rare, usually it's ppm (parts per million), specific examples would be something like 'more than 200 ppm of natural gas is harmful', meaning that out of a million 'units', which in this case would refer to molecules, natural gas molecules are 200 of them.

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