 In 2019 an environmental pressure group ranked Southampton as the fifth highest in a list of 50 European ports whose air was polluted by sulphur oxide.The cruise industry trade association Cruise Lines International Association claimed that the report was inaccurate and used highly questionable methodology.While Southampton is no longer the base for any cross-channel ferries, it is the terminus for three internal ferry services, all of which operate from terminals at Town Quay.