Researchers identify cruise ships as the source of pollution particles which may harm human health.
Tui has apologised and told passengers it has arranged flights home for tomorrow and a full refund.
It is 50 years since Portsmouth City Council created Portsmouth International Port.
Three thousand passengers spent Wednesday in Liverpool as the ship called at its spiritual home port.
Voters head to the polls on 18 June as seven candidates stand in Aberdeen South.
The ship's crew are expected to self-isolate after arriving at the Dutch port, their final destination.
Jake Rosmarin tells the BBC what it's like inside the national quarantine unit where he and 14 other passengers are staying in Nebraska.
The woman who was on a virus-hit ship shows "no signs of illness", the government of Pitcairn Islands, a British Overseas Territory, says.
One American passenger who sailed on the MV Hondius is now in a quarantine unit in Omaha, Nebraska.
