bunkering. Due to its geographical position on a major shipping route, Gibraltar is one of the largest bunkering ports in the Mediterranean, followed by neighbour Algeciras in Spain. The ports in the Straits — Algeciras, Ceuta and Gibraltar — are the second bunker market in Europe, behind the so-called Amsterdam-Rotterdam-Antwerp area. In Gibraltar of bunker fuel were delivered in 2007 compared with just in 1990 and bunkering is now the main activity within the Port of Gibraltar. Of a total of 8,351 deep-sea vessels which called at Gibraltar in 2007, 5,640 were supplied with fuel. Algeciras recorded bunker sales of about in 2008. From the 24,535 vessels called at the Port of Algeciras Bay, 2,173 took on fuel. Gibraltar in 2009 supplied over of fuel. The local CEPSA refinery produces supplies much of the fuel for bunkering in the bay which it delivers on seven dedicated barge to either Algeciras or Gibraltar. Pollution Due to all these facts and the heavy industries along the shoreline, airborne and marine pollution are serious problems in the area. Environmental groups have raised concerns about the risks of oil spills and other types of pollution, particularly in the light of the bay's ecological importance. In May 1998, an accident at the Acerinox plant in Los Barrios, caused the release of a radioactive cloud. The radiation was not detected on site, but was eventually detected in France, Italy, Switzerland, Germany, and Austria. The radioactive levels measured were up to 142 times higher than normal. Due to the large number of ships that transit the strait, there is always a danger of accidents and in recent years there have been a small number of sinkings, groundings and collisions in both Gibraltar and Spain resulting in oil spills (New Flame, Spa Bunker IV, Samothraki, Sierra Nava, Tawe and Fedra). Last report of Greenpeace on the pollution in Spain targets the Bay of Gibraltar as suffering from "chronic pollution" due to hydrocarbons, not only as a result of accidents, but also as a consequence of regular unballast, ship-to-ship bunkering or tank cleaning operations. During 2009, environmental organizations, both Spanish and Gibraltarian, have called the Tripartite Forum to implement measures to protect the Bay of Gibraltar. A joint statement was issued by concerned environmental groups on both sides of the frontier in relation to the trilateral forum meeting held in 2009. A report by the Gibraltar government in 2015