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Switzerland, officially the Swiss Confederation, is a landlocked country located at the convergence of Western, Central Southern Europe. Switzerland's natural landscape is marked by its numerous lakes and mountains, geographically divided among the Swiss Plateau, the Alps, and the Jura.

Hazardous substances can remain in the environment for a very long time, and harm ecosystems and human health. Although monitoring indicates that the loads of some substances have been reduced in recent years, many problems still persist. The increasing number of these man-made substances present in the environment is a matter of concern, and calls for the application of the precautionary principle.