Reducing the plasma power exhaust impacting on plasma facing components during steady state operation is one of the major design issues in future tokamaks such as ITER. Impurity seeding, e.g. with N, is one method of achieving this and has been used for a long time in tokamak research [1]. In this work we exploit a recently developed spectroscopic N II line ratio technique for measuring the divertor nitrogen concentration [2] and extend the measurements over a wider range of discharges from ASDEX Upgrade (AUG) and JET.