With northbound current (from the Baltic Sea) salinity may drop down a bit below 10 PCU (1.0% by weight), but with southbound current (from Cattegat) salinity rises to above 25 PCU, not so far from the northern Atlantic salinity of 30–33 PCU.
Also the areas along the Øresund coast has undergone considerable redevelopment, most notably with the establishment of Amager Strandpark in 2005 with a 2 km long artificial island and a total of 4.6 km of beaches.