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The level of carbon dioxide in air from remote locations is 0.0385% by number of molecules 0.0578% by mass City air or indoor air typically has significantly higher carbon dioxide levels. This has increased from about 0.031% by molecule (0.046% by mass) in the last century, and a pattern for the previous 400,000 years between 0.020% (0.030%) in the ice ages and 0.028% (0.042%) in the warmer interglacial periods.

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16y ago

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