Law-ref.org The 1985 Vienna Convention for the Protection of the Ozone Layer
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ARTICLE-Annex_I: Research and systematic observations     [go to this ARTICLE]
... The dominant sources of N2O are natural, but anthropogenic contributions are becoming increasingly important. Nitrous oxide is the primary source of stratospheric NOx, which play a vital role in controlling the abundance of stratospheric ozone. ...
... Fully halogenated alkanes are anthropogenic and act as a source of Cl0x which plays a vital role in ozone photochemistry, especially in the 30-50 km altitude region. ...
... Water, the source of which is natural, plays a vital role in both tropospheric and stratospheric photochemistry. Local sources of water vapor in the stratosphere include the oxidation of methane and, to a lesser extent, of hydrogen. ...