NOTICE: CDIAC as currently configured and hosted by ORNL will cease operations on September 30, 2017. Data will continue to be available through this portal until that time. Data transition plans are being developed with DOE to ensure preservation and availability beyond 2017.

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graphics Graphics: 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)

Worldwide Methane Concentrations

Halogenated Organic Compounds

Alkyl Nitrates

Other non-methane hydrocarbons