Smog alert

A woman dons a mask as she makes her way along the streets of Beijing in heavy smog on Feb. 21. The city went beyond measurable pollution levels and officials rushed to warn people to stay inside and avoid outdoor activities. Beijing’s air pollution is consistently ranked as among the worst in the world.

( Photo by Goh Chai Hin/AFP/Getty Images )

A woman dons a mask as she makes her way along the streets of Beijing in heavy smog on Feb. 21. The city went beyond measurable pollution levels and officials rushed to warn people to stay inside and avoid outdoor activities. Beijing’s air pollution is consistently ranked as among the worst in the world.

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