“…Most of these have been done in parts of Europe, but there are also two in Western Africa 421,422 and a number in East Asia. 423,424 One network, relying on SPMDs, has been measuring SVOC concentrations at 10 to 12 sites along a transect from Southern UK to Northern Norway from 1994 to 2008, with an unusually long deployment period of 2 years. 40,[42][43][44][45] Most of the other studies of this type used PUF-PASs and sampling periods ranging from 1 to 3 months.…”