The Slovak Republic follows the Directive for the approximation environmental legislation of the European Union issued by the UE Commission, and takes part in Meetings of the EU Commissioner for the Environment with environmental ministers of the Member States of EU and associated states.

The Slovak organizations participate in activities of several international non-governmental organizations with environmental orientation, such as International Ecological Association (INTECOL), International Association for Land Ecology (IALE), International Committee for Monuments and Settlements (ICOMOS), European Centre for Nature Conservation (ECNC) and many others.

Several non-governmental international organizations have their offices in Slovakia, e.g. Regional Environmental Centre (REC) for Central and Eastern Europe, Greenpeace International, International Union for Conservation of Nature and Natural Resources (IUCN), World Wildlife Fund (WWF) and many others.

Košice cooperates with the following twin cities:

Bulgaria – PLOVDIV, the Czech Republic – Ostrava, Finland – RAAHE, Hungary – MISKOLC, BUDAPEST, Poland – RZESZÓW, Russia – SANK PETERBURG, Germany – WUPPERTAL, COTTBUS, Italy – VERONA, Turkey – BURSA, the Ukraine – UZHGOROD, the USA – MOBILE, Serbia – NIŠ.

The agreements on cooperation also establish the requirements for the formation and conservation of the environment as a whole.