<page_title> List of treaties by number of parties </page_title> <section_title> List of treaties by number of parties </section_title> <table> <cell> Vienna Convention for the Protection of the Ozone Layer <col_header> Treaty </col_header> </cell> <cell> 193 <col_header> UN </col_header> </cell> <cell> 3 (COK VAT NIU) <col_header> Non-UN </col_header> </cell> <cell> 1 (EU) <col_header> Other </col_header> </cell> <cell> 197 <col_header> Total </col_header> </cell> </table>
Vienna Convention for the Protection of the Ozone Layer is one of the most successful treaties, having been ratified by 197 states (all United Nations members as well as the Niue and the Cook Islands) as well as the European Union.