ppm

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

ppm

abbreviation for

1. chem parts per million
2. AlsoPPM peak programme meter

Example Sentences

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

From The Daily Beast

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

From The Daily Beast

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

From The Daily Beast