Common Procedure for Identification of the Eutrophication Status of Maritime Area of the Oslo and Paris Conventions. Report on the Comprehensive Procedure for the Norwegian Skagerrak Coast
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- NIVA-rapport 
The Comprehensive Procedure has been applied to the inshore waters of the Norwegian Skagerrak coast, which has been divided into 44 areas. A total of 17 areas are classified as Problem Areas and 27 areas as Potential Problem areas. The frequent registrations of harmful algae and mussel toxins at a limited number of monitoring stations represents a problem in the classification process as such a registration alone may classify an area as a potential problem area. The causes behind toxic algae blooms and mussel toxin is still uncertain. For most areas there is a basic uncertainty about the existence of problems from harmful algae. A general approach has been to classify such areas as Potential Problem Areas.