First study on the dissolved PFASs in the open Western Mediterranean Sea waters.
PFHxA, PFHpA, PFOA, PFHxS and PFOS were the most abundant compounds.
Atlantic inflow and river discharge are likely the most important sources.
Open sea PFAS levels were lower than those detected along the coast of Spain.
Concentrations of PFHxA, PFHpA and PFHxS were higher than in the Atlantic Ocean.