The men's triathlon at the 2024 Paris Olympics has been postponed due to high pollution levels in the River Seine, attributed to heavy rainfall on July 26 and 27 that worsened water quality. Despite the French government's significant investment of €1.4 billion to clean the river, tests revealed E. coli levels exceeding acceptable limits. Both the men's and women's triathlons are rescheduled for July 31, subject to further water quality tests, with a contingency plan to convert the events to duathlons if conditions do not improve. Officials remain optimistic but cautious, given the forecasted rain which may further affect bacterial levels in the river. The health of athletes remains the top priority for organizers, who have arranged additional testing and contingency plans to ensure safe competition conditions.