Calculations based on the sulphur protocol, show that the areas in Norway where the critical load has been exceeded, will be reduced to about 11 per cent in the year 2010. Effects Acid rain leads to corrosion of buildings. The acids corrode e.g. metals, paints and concrete. In Europe this is an increasing problem because historical constructions have become severely damaged. In Norway, this type of corrosion causes damages for NOK 2-300 million each year.
Estimates show that Norway's total acid rain bill is approx.
NOK 3,2 billion per year. 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.