Environmental status

Sampling of the different environmental parameters in the Sound
On both the Danish and the Swedish side of the Sound, various sampling programmes have been arranged in order to monitor the status of the environment in the Sound. Measurements are made of physical-chemical parameters such as nutrient concentrations, temperature, salinity, chlorophyll-a concentration and the oxygen content in the water column. Inventories are made of the bottom fauna and the distribution of the eel grass, biomass and shoot density are examined at regular intervals. The concentrations of environmentally hazardous substances in sediment and blue mussels are also studied in certain sampling programmes. Read more about the samplings

Nutrients and algal bloom in the Sound
The Sound is affected by increased concentrations of nutrition created by human activities. High concentrations of nutrition cause changes in the eco-system. Some quickly growing annual algae are favoured at the expense of perennial macro algae. There are also more extensive algal blooms.
Facts and status on nutrition concentrations in the Sound
Facts and status for algal blooms in the Sound >>

Lack of oxygen on the bottom of the Sound
Overfertilisation causes increased organic load on the bottom substrate. An extension of this can create a lack of oxygen in the bottom sediment and in the water closest to the bottom. This results in the fish migrating and if the lack of oxygen is serious, the bottom fauna will be eliminated wholly or partly.
Facts and status of oxygen content in/on the bottoms of the Sound

Environmentally hazardous substances in the Sound
The knowledge about organic environmentally hazardous substances in the Sound is limited. A relatively slight number of substances have been studied and the measurement series are often short. However, on the very basis of the studies so far carried out it is possible to conclude that the environmental objectives for the Sound have not been met. Organic tin compounds occur, for example in concentrations where they harm marine organisms, and substances which have long been banned such as DDT and PCB have been shown in different organisms. In general, the load of metals and the affect on organisms have declined in the Sound region. This is attributed to improved purification and management methods and reduced emissions from industries. However, individual studies indicate that considerable metal pollution may still occur locally

Monitoring of the environment around the Öresund fixed Link.
On the establishment of the Sound communication between Copenhagen and Malmö, several environmental parameters were monitored.

The quality of the bathing water for the bathing sites of the Sound
The bathing water in the Sound has generally enjoyed a good quality over recent years. There have only been problems in individual years and at a few places in connection with flooding (overflow) from the waste water system. In 1997 and 2001, algal blooms of toxic blue-green algae occurred and in certain areas bathing was not advisable.