Gases in the Atmosphere

The composition of gases in the air has stayed fairly constant over the past 200 million years. It is made up of a mixture of gases, with the two main components being nitrogen and oxygen.

  • 78% Nitrogen (N2)
  • 21% Oxygen (O2)

The remaining gases include:

  • Water vapour (H2O)
  • Carbon dioxide (CO2)
  • Trace amounts of the noble gases