Map: Regional distribution of areas with fish stocks affected by acidification in Norway 1950-1990. Source: DN, Directorate for Nature Management.
The situation is worst in southern Norway:
The sulphur content in precipitation has been reduced by more than 40 per cent since 1980. The water courses in this area have subsequently become less acidic. However, the critical load has been exceeded in large areas in southern Norway. The situation is worst in the Agder counties, where the critical load has been exceeded by more than 90 per cent.
There are indications that there is an increasing acid rain problem in the eastern region of Finnmark county (the northernmost in Norway) as a result of emissions from industry in Russia (Nikel and Zapoljarnij).
The damages are most severe where the ground consists of hard rock species with low contents of calcium and which weather slowly, such as granite and gneiss. Acid rain has had catastrophic consequences on fresh water fish stocks in Agder, Telemark and Rogaland counties.