December 2, 2010 2:39 PM

What's missing in Mexico City? Dirty air

Slowly and steadily, this sprawling city is cleaning up its air. A haze still covers Mexico City, and ozone levels are often unhealthy. But the capital is no longer the smog-choked city of two decades ago, when birds were said to fall from the sky dead. It's been years since teachers kept kids off playgrounds to prevent respiratory illness.

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