ppm
American-
Also PPM, P.P.M., p.p.m. parts per million.
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pulse per minute.
abbreviation
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chem parts per million
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Also: PPM. peak programme meter
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Humans evolved when atmospheric CO2 concentrations were approximately 280 to 300 ppm.
From Science Daily ● Aug. 15, 2026
During the past decade, atmospheric levels have risen by an average of about 2.6 ppm each year, while 2024 alone saw an increase of 3.5 ppm.
From Science Daily ● Aug. 15, 2026
More than 80% of soil samples tested in 2022 — seven years after that plant closed — were above the 80 ppm threshold for lead, according to a recent report.
From Los Angeles Times ● Aug. 23, 2025
The residents wanted to grow food, he said, but the soil had lead levels around 112 ppm, well over the state limit.
From Los Angeles Times ● Apr. 24, 2025
Turbidity is consistently more than 100 ppm in the lower portions of the mainstream and major tributaries, but is usually lower in the upper portions of tributaries.
From Fishes of the Wakarusa River in Kansas by James E. Deacon
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
