 Paris says the water quality of the River Seine has improved and been clean enough for bathing on 10 or 11 of the past 12 days. Because of heavy rainfall and rising pollution levels earlier this month, there have been concerns that the river might be too contaminated to host triathlon and marathon swimming events in the Olympics, which start in two weeks. One official said he wasn't concerned about the viability of the competitions, though there might have to be what he called modifications.