What environmental issue was very apparent during the 2008 Olympic Games in Beijing?

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The air pollution in Beijing during the 2008 Olympic Games was very apparent, with many athletes and visitors experiencing respiratory issues and concerns about the impact on their health. The city had to take measures such as shutting down factories, limiting car use, and seeding clouds to try and improve air quality during the Games.

What Environmental Issue Was Very Apparent During the 2008 Olympic