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Climate & environment

Parts per million

A measure of concentration: the number of molecules of a gas in every million molecules of air. It is the usual unit for carbon dioxide in the atmosphere.

In the news

Carbon dioxide reached a record 426.8 ppm in 2025, the World Meteorological Organization said.

Related termsGreenhouse gas

“Parts per million” in our stories

AnalysisClimate

The language of climate

The words we choose shape the response we get. A closer look at how climate is described, and what it leaves out.

·Rational Times Editorial·1 min read