Paris Olympics: Seine pollution leaves triathlon events in uncertainty

While athletes are expected to swim through the River Seine during the triathlon events of the Paris Olympics, training sessions have repeatedly been cancelled due to the river’s fluctuating water pollution levels. As Crystal Goomansingh explains, time is running short for the Seine to be clean enough for triathletes.

• Ultrafine particles linked to 1,100 deaths per year in Canada’s 2 largest cities: study