Read an article earlier(which I can't find now, on the new cruise terminal at Greenwich and the fight by local residents frightened by the possible high rise in pulmonary conditions.
Quite rightly they say that some of today's liners are the size of towns with around 800 people on board and they cite people living near the terminal in Southampton having high rates of illness. the "Crystal Symphony" no stranger to Dover got a mention but typically Dover didn't.