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EnglishTHE SCHOLAR'S LEXICON

ppm

ppm

Definitions

  1. 1
    • : Also PPM, P.P.M., p.p.m. parts per million.
    • : pulse per minute.

Examples

  • Prior to the Industrial Revolution of the late 19th and early 20th centuries, the carbon dioxide level was about 280 ppm.

  • Today global atmospheric carbon dioxide concentrations are at 395 parts per million (ppm).

  • Atmospheric carbon-dioxide levels have risen 38% in the industrial era, from 280 to 385 parts per million (ppm).

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