Parts Per Million (ppm)
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- Number of parts of a chemical found in one million parts of a particular gas, liquid, or solid. See concentration.
EPA - Cite This Source - This Definition - Number of parts of a chemical found in one million parts of a particular gas, liquid, or solid. See concentration.
EPA - Cite This Source - This Definition - Coal gasification, Coal liquefaction, Condensation, evaporation, Municipal Solid Waste (MSW), Parts Per Billion (ppb), Sublimation