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 following chemical substances of natural and anthropogenic origin, not listed in order of priority, are thought to have the potential to modify the chemical and physical properties of the ozone layer. ...
... Carbon monoxide has significant natural and anthropogenic sources, and is thought to play a major direct role in tropospheric photochemistry, and an indirect role in stratospheric photochemistry. ...