Parts Per Million

Last updated: August 12, 2018

What Does Parts Per Million Mean?

Parts per million (PPM) is a unit of measurement used when expressing a very dilute concentration level of pollutants in the air, water and other fluids. For example, 1 PPM of ink in water means that in a million mass units of water there would be one mass unit of ink. Thus, PPM refers to one item in a million of anything of the same size.

Safeopedia Explains Parts Per Million

PPM is commonly used in measuring air, water and body fluids pollution. PPM is the mass ratio between a component and a solution. Mathematically, 1 PPM can be expressed as following:

  • 1 PPM = 1 mg/kg
  • 1 PPM = 1 mg/ltr
  • 1 PPM = 0.0001 %

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