Altogether, 22 porpoises were analyzed for organochlorines (PCBs DDTs, HCHs, HCB), PBDEs, HBCDD and CPs in blubber, and 23 porpoises for PFAS and OTCs in liver, and metals and Se in muscle and liver, and SI (d13C and d15N) in muscle. The animals were divided into four groups: animals originating from the North Sea Population area (juveniles and adults) and animals from the Belt Sea Population area (juveniles and adults). Generally, no difference in concentrations or SI signatures were seen between the two areas, only few exceptions. Juveniles had a higher SI signature compared to adults, probably at least partly due to fact that they still carry the signature from the lactation period. Generally, concentrations of metals were higher in liver compared to muscle. Strong correlation between Hg and Se was seen in liver but not muscle. Concentrations of Hg vs Se on a molar weight basis showed that a majority of the porpoises had an excess of Se. One porpoise had concentrations of Hg in liver above the level of observed negative effects that have been seen in dolphins.Concentrations of OTCs were generally low, but one specimen had concentrations at levels of concern. It was a 16-year-old male that had elevated concentrations of ΣOTCs (TBT+MBT+DBT), higher than has been suggested cytotoxic level for marine mammals.Seven porpoises had concentrations of Σ7PCB above a suggested threshold for adverse effects on health (one juvenile and six adults) – even though the suggested threashold levels include more than only 7 PCBs. One lactating five-year-old female had very low concentrations of organochlorines. Two adult porpoises had extremely low concentrations of PFAS.