According to a study by the European Federation of Transport and the Environment, Lisbon was the city with the largest number of cruise ships in 2017 and is the sixth most polluted port city in Europe. Mass tourism is affecting Lisbon and the expansion of its cruise ship capacity is reflected in pollution levels, including sulfur dioxide emissions. In total, Europe's 200 cruise ships pollute more than all European cars. What is the ranking of the most polluted cities in Europe? What does Lisbon intend to do to counter the trend? Lisbob, the expatriate assistant in Portugal, tells you everything about this news that falls for Lisbon freshly elected "Green Capital of Europe".