Abstract In our earlier work oil pollution of east Turkish Mediterranean area was determined before and after service of Iraq -Yumurtalik export pipeline in 1997. In this paper oil pollution amount is given in the same area in 1999. The highest pollution was found as 2690 .tg/L at Botas and 629.60 gg/L at Mersin. The determination was made by using Iraqian and Iranian crude oils as reference material. The oil amount was found lower when chrysene was used as a reference. The low amount of oil pollution measured by earlier workers in the same area can be attributed to this fact. The use of polluting crude oil as reference material gives reliable results to determine oil pollution.