NOTICE (September 2017): Data previously stored at the CDIAC archive are being transitioned to the new, ESS-DIVE archive. This website provides access to the CDIAC data during the transition. If you have any questions regarding the new archive or the data transition, please contact

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data Data: Atmospheric Trace Gases in Whole-Air Samples

The following links are for methane, nonmethane hydrocarbons, alkyl nitrates, and chlorinated carbon compounds including three chlorofluorocarbons (CFC-11, CFC-12, and CFC-113)

data Worldwide Methane Concentrations

data Halogenated Organic Compounds

  • Carbon Tetrachloride
  • CFC-11
  • CFC-12
  • CFC-113
  • Chloroform
  • Halon 1211
  • Methyl Chloroform
  • Tetrachloroethene

data Alkyl Nitrates

  • Ethyl Nitrate
  • Methyl Nitrate
  • i-Propyl Nitrate

data Other non-methane hydrocarbons

  • Ethyne
  • Ethane
  • Propane
  • i-Butane
  • n-Butane