The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
The concentration (or level) of a substance characteristic of a particular medium (e.g. soil, water, rock etc.) in an area or region arising from both natural sources and non-natural diffuse sources such as atmospheric deposition. (after definition for background concentration soil, ISO 11074-1:1996)
The term "background concentration" was found in the following pages: