Pollution measures

People wearing face masks to protect against heavy pollution walk near the Forbidden City in Beijing. Beijing residents were urged to stay indoors Thursday as pollution levels soared before a sandstorm brought further misery to China's capital.

( Ed Jones, AFP/Getty Images / February 28, 2013 )

People wearing face masks to protect against heavy pollution walk near the Forbidden City in Beijing. Beijing residents were urged to stay indoors Thursday as pollution levels soared before a sandstorm brought further misery to China's capital.

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