Paris Mayor Anne Hidalgo plans to swim in the Seine River to demonstrate its cleanliness for upcoming Olympic events, despite ongoing pollution concerns and a history of high bacteria levels. The river's viability for swimming competitions has been a point of worry, with recent tests showing acceptable bacteria levels for the first time. Despite a 1.4 billion Euro clean-up effort, concerns persist over the river's suitability for Olympic events, with organizers aiming for safe conditions for the triathlon and marathon swimming. Mayor Hidalgo's commitment to swimming in the Seine, along with French President Macron's potential swim, reflects efforts to showcase the river's improved state, although challenges due to heavy rainfall and pollution threats loom over the upcoming Paris Olympics.