Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Venice and its Lagoon' has mentioned 'Pollution' in the following places:
Occurrence Sentence Text Source
Although the city is facing some challenges (including an excessive number of tourists and problems caused by pollution, tide peaks and cruise ships sailing too close to buildings),[12][13][14] Venice remains a very popular tourist destination, a major cultural centre, and has been ranked many times the most beautiful city in the world.
[12] The city is also facing other challenges, including erosion, pollution, subsidence, an excessive number of tourists in peak periods, and problems caused by oversized cruise ships sailing close to the banks of the historical city.
In addition to accelerating erosion of the ancient city's foundations and creating some pollution in the lagoon,[12][112] cruise ships dropping an excessive number of day trippers can make St. Marks Square and other popular attractions too crowded to walk through during the peak season.
However, the activist group No Grandi Navi (No big Ships), argued that the effects of pollution caused by the ships would not be diminished by the re-routing plan.