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What is the current carbon dioxide level in the atmosphere?

In: Chemistry, Earth Sciences, Atmospheric Sciences [Edit categories]

Answer:

390 parts per million by volume or 591 parts per million by mass. This is 0.039% of the total atmosphere (by volume).

This is approximate. CO₂ varies slightly in a yearly cycle, and is also increasing steadily due to anthropogenic (man-made) emissions.

Carbon dioxide is a well-mixed gas. This means that it doesn't matter where it is measured, it will show the same value because (on average) it is evenly distributed throughout the globe.

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