Pollution in the River Seine has led to the cancellation of Olympic triathlon training for two consecutive days, raising concerns about water quality ahead of the men's event scheduled for Tuesday. Heavy rains over the weekend overwhelmed the sewer system, causing untreated effluent to enter the river, resulting in unsafe swimming conditions. Organizers from Paris 2024 and World Triathlon have stated that athlete health is their priority, and contingency plans are in place to replace the swimming portion with a duathlon if necessary. Despite these challenges, officials remain optimistic that improved weather conditions will enhance water quality in time for the competition. Significant investments have been made to rehabilitate the Seine, which has not been swum in for over a century due to pollution concerns. The situation continues to evolve, with daily water quality tests being conducted to determine the viability of holding swimming events.