Percentage Carbon Dioxide in Earth's Atmosphere

Not Reviewed
Constant / Last modified by mike on 2015/07/30 06:09
`CO_2_"ATM" = 0.039 %`
MichaelBartmess.Percentage Carbon Dioxide in Earth's Atmosphere

This constant defines the typical volumetric percentage of Carbon Dioxide present in a sample of the Earth's atmosphere.  Dry air by volume contains the following major constituents:

  • 78.09% nitrogen
  • 20.95% oxygen
  • 0.93% argon
  • 0.039% carbon dioxide

The amount of water vapor contained in air is on average 1% but varies.  (Humidity is a pain; gotta love Colorado.)