"The European Union has also put more attention to reduce marine pollution after years of efforts to control emissions from industries, power plants and road transport. Ships have traditionally been big polluters because they use heavier, less refined fuels that are cheaper to burn but more caustic for the air. “Part of the shipping industry, fear a loss of competition if they implement NOx abatement technology. Swedish and Norwegian shipping industries have done it for several years now and this don´t prevent them to be competitive." (Quoted from article)