# Tag Info

### What is the current atmospheric concentration of $\small\sf{CO_2}$ in the atmosphere in atm (or bar)?

Not nearly so elegant as @fred answer: 400 ppm = 0.04% , then CO 2 is 0,04 % or 0.0004 atm.
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### What is the current atmospheric concentration of $\small\sf{CO_2}$ in the atmosphere in atm (or bar)?
What I think you are asking for is the partial pressure of carbon dioxide in the atmosphere. The partial pressure of carbon dioxide can be determined, where, $P_{CO_2} \ = \ x_{CO_2}\cdot P_{atm}$ One ...