There's loads more oxygen in the atmosphere than C02, so presumably what gets combined with carbon would make little difference proportionately.
Air Composition
The sea-level composition of air (in percent by volume at the temperature of 15°C and the pressure of 101325 Pa) is given below.
Name Symbol Percent by Volume
Nitrogen N2 78.084 %
Oxygen O2 20.9476 %
Argon Ar 0.934 %
Carbon Dioxide CO2 0.0314 %
Neon Ne 0.001818 %
Methane CH4 0.0002 %
Helium He 0.000524 %
Krypton Kr 0.000114 %
Hydrogen H2 0.00005 %
Xenon Xe 0.0000087 %
Source:
CRC Handbook of Chemistry and Physics
by David R. Lide, Editor-in-Chief
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