Seine River in Paris still too polluted for Olympic events as opening ceremony looms

• The Seine River is too polluted for swimming events at the Paris Olympics, city officials said.
• Paris invested $1.5 billion to clean the Seine, but heavy rainfall increased pollution levels.
• The Seine has been off-limits for swimming since 1923 due to severe pollution.

Despite a massive cleanup effort, Paris' Seine River remains too polluted to host swimming events for the upcoming Olympic Games, city officials have said.