Marathon men and women hoping to go in Seine

PARIS : Open-water swimmers are hoping to plunge into the river Seine for 10km marathon races at the Paris Olympics on Thursday and Friday but pollution readings will have the final say.

Fluctuating levels of bacteria have given organisers headaches for months, forcing the postponement last week of triathlon training sessions and the 400m men's swim in that event.

Although the French authorities have spent 1.4 billion euros ($1.53 billion) on upgrading the capital's sewage systems, with cleaning up the Seine a top Olympic legacy, regular checks of the river's health continue to cause concern.

Multiple tests are being carried out daily, with the first of two planned familiarisation days cancelled on Tuesday after a situation meeting between World Aquatics, Paris 2024 organisers and city authorities.

World Aquatics said the latest water quality review showed E.Coli levels ranged from 'very good' to 'good' at four collection points but Enterococci levels exceeded maximum thresholds.

"World Aquatics and Paris 2024 remain confident that the Marathon Swimming competitions on 8 and 9 August will proceed as planned," the world body added.

Organisers have said they have a backup plan, with the Vaires-sur-Marne rowing and canoe venue available just outside the capital.

There is also the possibility of holding both men's and women's races on the same day if a postponement is deemed necessary, with the Games ending on Sunday.

Assuming the Seine passes the test, the races will offer some riverside spectators a free treat with the Olympic action taking place against a backdrop of a 200-year-old bridge and the looming Eiffel Tower.

The races - women on Thursday and men on Friday - feature a 1.67km loop completed six times between the Alexandre