I just took a cruise through the sounds of New Zealand and the one thing that annoyed me was the exhaust from the ship obscured part of the view.
https://www.stand.earth/sites/defau...r-pollution-on-the-decks-of-4-cruise-ship.pdf
"Concentrations of PM (particulate matter) on the decks of these ships are comparable to concentrations measured in polluted cities, including Beijing and Santiago. Despite being on the open water and in open air, vacationers and cruise ship staff may be exposed to elevated concentrations of PM"