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Chemical elements
  Oxygen
    Phlogiston
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
    Ozone
    Atmosphere
      Oxygen in Air
      Carbon Dioxide
      Water-Vapour
      Desiccation of Air
      Atmospheric Ozone
      Atmospheric Nitrogen
      Hydrogen in the air
      CO in Atmosphere
      Miscellaneous Substances
      Soil Atmosphere
      Mine Air
      Tunnel Air
      Dust
      Bacteriology of Air
      Respired Air
      Air Mixture
      Physical Properties
      Liquid air
    Water
    Hydrogen peroxide

Hydrogen in the air

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The proportion of hydrogen in the air varies considerably, although it is always minute. The hydrogen content, however, is believed to increase with the altitude. In the spectrum of the aurora the intensity of the nitrogen lines diminishes and that of the hydrogen lines increases with increasing height. The hydrogen originates from volcanic emanations as well as from bacterial activity.